You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Catherine Martin. Can you please book a flight ticket from DTW to PHL?

ASSISTANT: Sure, please tell me your trip dates.

USER: Sure, I need to travel on dates of 04/25 and 04/27.

ASSISTANT: Sorry, there is no plane as per your requested information.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: My pleasure, have a great day.