今伺いますって英語でなんて言うの？

Both of these phrases can be used to mean the same thing as 'I'll be right there'. 'I'm on my way' gives the impression of current progress toward the location.

If you are wanting to say you will be with someone quickly then you could say simply 'I'll be right there' or 'I'll be right with you' You could also say 'I'm just coming to you now, sir/madam' when speaking to customers in a restaurant you would add 'sir or madam' to be polite when speaking to them

All three of these sentences are appropriate ways to interact with a customer in a Western restaurant. The first sentence say that you will be at their table as soon as possible. However, sometimes you are not immediately free. You may be helping another customer and need to finish that first. The second sentence says that you will be able to help them in "just a minute". This is an English language idiom that means you need a little time before you can help them. It is not to be read literally. The last sentence expresses the same idea in another way. "As soon as I can" communicates that you are in the middle of a task and as soon as you are free, you will be able to help them. When working in a restaurant, you often have to juggle more than one task at a time. These three sentences will help you do so professionally and politely.

Both of these phrases are asking the customer politely if they will wait for two seconds while the waiter does something else.

The two sentences you see provided above are terrific ways to express to your listener that you will be right there. In the first sentence you will see the word bit. This word means shortly or soon. In the second sentence you will see the word sec, which is short for second.