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

ASSISTANT: Hello, how may I assist you today?

USER: I heard that Houston is a best place to visit, Can you please help me to book a ticket?

ASSISTANT: Sure, May I know your airport codes and travelling dates?

USER: My source is Houston, TX - HOU. My travel dates are 08/15 and 08/17.

ASSISTANT: Let me know your destination airport code.

USER: My destination airport code is TX - IAH.

ASSISTANT: Thank you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, We found Delta airline with flight number 1000 and price is 200 matches your requirement.

USER: You can proceed for booking.

ASSISTANT: Ok, Your booking has been done.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us, Have a nice journey.