You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amanda Evans.

ASSISTANT: Evans, how may I guide you?

USER: I would like to visit Washington, can you help me in booking a flight ticket?

ASSISTANT: Sure Evans, I am here to help you. Could you please share me your source airport code and destination airport code?

USER: My source code is IAH and destination code is DCA.

ASSISTANT: When would you like to travel?

USER: My travel dates are 03/25 and 03/27.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: Evans, sorry for inconvenience, no flights are available on your prefer dates.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.