You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from CLT to DCA, Can you please help me for booking?

ASSISTANT: Can you please provide me with the planned travel dates?

USER: I would like to travel on 09/28 to return on 09/30.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know if you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I ask you for your name please?

USER: Ryan King here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Ryan King, I regret to inform that there are no flights on your route with the given dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.