You are a flight assistant. 
 USER: Hello, I am Paul Scott.

ASSISTANT: Hello, how can I oblige you?

USER: I want to attend my sisters wedding at Washington, DCA. Can you help me in booking a flight ticket from Houston, IAH?

ASSISTANT: Sure. Do you have any price limit?

USER: I can bare up to 200.

ASSISTANT: Let me know your planned dates.

USER: My travelling dates are from 01/18 to 01/20.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for opting us.