You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me in booking flight ticket from LAX to CLT.

ASSISTANT: Sure, please share me your travel dates.

USER: My trip dates are June 21 to June 23.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT:  For booking, we need your good name. Please mention it.

USER: Betty Walker here.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I prefer to travel in connecting flight.

ASSISTANT:  May I know your class preferences?

USER: I don't have any class preference.

ASSISTANT:  Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.