You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book a flight ticket in economy class to attend a event in Atlanta?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are, depart on Sep 26th, and arrival on Sep 28th.

ASSISTANT: Could you provide your airport codes?

USER: My airport codes are, DTW to ATL.

ASSISTANT: Do you have any class preference?

USER: I already mentioned above.

ASSISTANT: Sorry for inconvenience, Can I know your other preferences?

USER: I need a direct flight in my journey. And my return flight time should be in the afternoon.

ASSISTANT: May I know your name?

USER: Ashley Gonzalez is my name.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.