You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Patrick Hill here. I'm planning to visit Washington, can you please book a ticket from BOS to DCA?

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

USER: Sure, my planned departure and return travel dates are 26th and 28th of August.

ASSISTANT: May I know your good name to proceed further?

USER: I have already mentioned it above.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a direct flight.

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

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for choosing us.