You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I planned a trip to Detroit for hiking in Detroit mountains with my friends, so I want to book a ticket from Atlanta. Can you help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am starting my trip on 03/15 from Atlanta ATL airport.

ASSISTANT: Please provide your return journey details.

USER: My trip will complete on 16th, so I want to return on 03/17 from Detroit DTW airport.

ASSISTANT: Please give me a moment.

USER: Sure, take your time but revert me with best flight available.

ASSISTANT: Please mention the name for processing.

USER: Please reserve the ticket on the name Sarah Parker.

ASSISTANT: There is no flights available with your preferable details.

USER: That's ok, I will check for other alternatives, anyway thank you for your information.

ASSISTANT: Welcome, have a great day.