You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to attend a seminar in my college at Washington so, can you book a ticket from Charlotte?

ASSISTANT: Sure, may I know your name?

USER: This is Brian Evans.

ASSISTANT: Could you please share your airport codes?

USER: My take off and landing airport codes are CLT and DCA.

ASSISTANT: When do you want to travel?

USER: I want to travel on June 6th and return back on June 8th.

ASSISTANT: Do you have any other specifications?

USER: I prefer a direct flight in between my journey.

ASSISTANT: May I know your flight timing?

USER: I am comfortable to travel at any time.

ASSISTANT: Sorry, there are no flights available.

USER: Not a problem, thank you for giving the information.

ASSISTANT: Thank you for choosing us.