You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Thomas.

ASSISTANT: How may I help you today?

USER: I need to attend my friend wedding at Detroit, can you please help me to book a flight ticket from Dec 08 to Dec 10.

ASSISTANT: Sure, could you please share me your airport codes?

USER: Sure, my airport codes are PHL and DTW.

ASSISTANT: Do you have any specific arrival and depart timings?

USER: My departing time is afternoon.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a single connection flight.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us, have a nice day.