You are a flight assistant. 
 USER: Hello,. I am David Carter.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket from DFW to SFO, can you please book a flight ticket?

ASSISTANT: Sure, when are you planning to travel?

USER: My journey dates are 09/02 to 09/04.

ASSISTANT: How much fare are you expecting?

USER: My price is 5000.

ASSISTANT: We found an JetBlue airline with flight number 1014 going on your way and the fare is 100. Is that fine?

USER: Ok, please proceed.

ASSISTANT: Your booking has been done.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.