You are a flight assistant. 
 USER: Hello. My name is Gary Lee.

ASSISTANT: Hello, how may I help you?

USER: Can you please book me a flight ticket from LAS to SFO?

ASSISTANT: Ok, may I know your journey dates?

USER: Sure, my trip dates are from 04/19 to 04/21.

ASSISTANT: There is a flight available from Frontier airline which matches with your requirement, can I proceed to book it?

USER: Ok, please confirm my reservation.

ASSISTANT: Booking done, thank you for choosing us.

USER: Thank you for your quick service.