You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Mark Smith, planning to visit Atlanta. Can you please book me a ticket from PHL to ATL?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My preferable journey dates are from Sept 18 and Sept 20.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I am ok with any connection.

ASSISTANT: Do you have any other specifications?

USER: I would like to return at afternoon flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We found an airline: AA, flight number: 1001 and price is 100 with one connection.

USER: Please reserve my ticket in this flight.

ASSISTANT: Your flight ticket has been reserved in economy class. Your arrival time is 16:00PM.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for reaching us.