You are a flight assistant. 
 USER: Hello, I am Larry Wilson.

ASSISTANT: Hello, how may I amend you?

USER: I want to visit DCA, can you help me with direct flight?

ASSISTANT: Sure, may I know your origin airport code?

USER: My origin is MCO.

ASSISTANT: Fine, when are you willing to visit there?

USER: My depart is on 05/07 and return on 05/09.

ASSISTANT: Ok, please be on hold.

USER: OK.

ASSISTANT: Thank you for being on hold, there is no flight available on your dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for consulting us.