You are a flight assistant. 
 USER: Hi. I am Susan Mitchell.

ASSISTANT: Hello, how may I help you?

USER: On my holiday vacation, I am planning to visit independence hall at Philadelphia, PHL. Can you reserve me a flight ticket on 12/14?

ASSISTANT: Sure, please share your return date?

USER: I intend to return on 12/16.

ASSISTANT: May I know the origin airport code?

USER: My take off airport code is Minneapolis, MSP.

ASSISTANT: Sorry, no flights found on your given dates.

USER: It's ok, I will check with another airline. Thank you for the information.

ASSISTANT: Thank you for choosing us.