You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I need you to book a flight ticket from SFO to CLT, Please help me.

ASSISTANT: Sure, can I know your good name please?

USER: Benjamin Campbell here.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a direct flight.

ASSISTANT:  When you are willing to travel?

USER: July 26 and 28 are my planned travelling dates.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I wish to return in the afternoon.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.