You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: This is Donna Evans. I am voracious reader, I want to visit The Billy Graham (library) in Houston. Can you please help me in booking flight ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: My source airport code is TX - DFW and my destination airport code is TX - IAH.

ASSISTANT: When are you going to travel?

USER: My travel dates are from 08/07 to 08/09.

ASSISTANT: We found a flight on southwest airline, flight number as 1009 with the fare of 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for availing us.