You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to visit Houston Zoo, TX-HOU with my friends. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: The departure date is 02/22 and the return date is 02/24.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Ok, may I know your source code?

USER: The source code is from DC-IAD.

ASSISTANT: Ok, there is a flight 1003 in Southwest airline matching your details with price 100. Shall I proceed?

USER: Yes, proceed with my booking in the name of George Nelson.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your service.

ASSISTANT: You are welcome.