You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are May 13 to May 15.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight and depart should be in afternoon.

ASSISTANT: May I know your name?

USER: Amy Young.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.