You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Seattle, can you please book me a ticket from DCA to SEA?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My preferable journey dates are Aug 11 and Aug 13.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Is there any class preference?

USER: I prefer economy class flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I would like to return in the morning flight.

ASSISTANT: May I know your good name?

USER: My name is Janet Thomas.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you.