You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Mark Moore here. I want to book a flight from DEN to IAH, can you please help me in booking a flight ticket?

ASSISTANT: Sure Mark, can I know the travel dates please?

USER: Sure, my travel dates are from 01/10 to 01/12.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your time.

ASSISTANT: There is a flight in UA airline with price 100, can I book it?

USER: Ok, please proceed with booking.

ASSISTANT: Your ticket has been booked with flight number 1019.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.