You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Helen Phillips.

ASSISTANT: How can I assist you?

USER: I want to travel from AUS to DTW. Will you please help me in booking my ticket?

ASSISTANT: Sure Helen, please tell me your trip dates.

USER: My trip dates are from 02/11 to 02/13.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Helen, I cannot find any flight as per your details.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.