You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER:  I want to travel from Detroit to Philadelphia.

ASSISTANT: Sure, may I know airline codes and your journey details?

USER: Yes, my travel day is from dec/22 to dec/24. My airport codes are  to PA-PHL from MI-DTW.

ASSISTANT: May I know your name?

USER: I am Benjamin Brown.

ASSISTANT: OK, please wait a moment I will check and get back to you.

USER: OK.

ASSISTANT: Sorry, there is no flights found on your details. Thank you.

USER: OK, thank you for the information.

ASSISTANT: Have a nice day.