You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I aid you today?

USER: Please help me in booking flight ticket from IAD to DCA.

ASSISTANT: Sure, when are you planning to start and return on?

USER: My trip dates are Jan 19 to Jan 21.

ASSISTANT: Do you need a connecting flight?

USER: I prefer to travel in connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I know your good name?

USER: Ashley Taylor here.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you.