You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I assist you today?

USER: I am planning to attend my sister's wedding party form SFO to DCA. Can you find a ticket for me?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my travelling dates are 03/29 to 03/31.

ASSISTANT: Ok, wait for a moment.

USER: Sure, ok.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: OK, no problem.

ASSISTANT: Thank you for contacting us. May I know your name?

USER: Yes, I am Ashley Edwards. Thank you for your help.