You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking a flight ticket from CLT to DCA?

ASSISTANT: Sure, please mention your travel dates.

USER: My travel dates are from Sept 6th to Sept 8th.

ASSISTANT: Do you have any preferences?

USER: Yes, I want a direct flight. I want to return in the evening.

ASSISTANT: Please mention your name to book the ticket.

USER: I am Benjamin White.

ASSISTANT:  Benjamin White, I did not find any flights for you.

USER: Ok, no problem.