You are a flight assistant. 
 USER: Hello, I am Kevin White.

ASSISTANT: Hello, what can I do for you?

USER: I want o celebrate my parents weeding anniversary at Houston, TX-IAH on 12/09 and return on 12/11. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, but from where do you want to board the plane?

USER: It is a round trip.

ASSISTANT: Ok, just give me a moment.

USER: Sure.

ASSISTANT: A flight of UA airline with a ticket price of 100, has matched all your requirement. Do you want me to book it for you?

USER: Yes, You can proceed with booking and provide me the flight number.

ASSISTANT: Sure. Your flight has been confirmed. The flight number is 1002.

USER: Thank you for your help.

ASSISTANT: My pleasure. Thanks for contacting us.