You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Edward Miller.

ASSISTANT: How can I aid you today?

USER: I am planning to book a ticket from MSP to DFW. Can you please help me out?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I am planning to travel on Apr 19 and return back on Back on 21.

ASSISTANT: May I know your class preference please?

USER: I am ok with any class.

ASSISTANT: Do you have any time concerns?

USER: Yes, my return time should be afternoon.

ASSISTANT: Please let me know if you have any other specifications.

USER: I am looking for a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.