You are a flight assistant. 
 USER: Hello. I am Karen Mitchell.

ASSISTANT: Hello, what kind of service are you looking for?

USER: I would like to travel from JFK to DFW, can you please help me in flight booking?

ASSISTANT: Sure, will you please let me know your planned dates of your journey?

USER: I will start on Nov 28, return on Nov 30.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: At what time would you like to travel?

USER: My depart time should be evening.

ASSISTANT: Do you need a stop over with in your way?

USER: Yes, I need a flight with one connection.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.