You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a ticket from DCA to SEA, hope you are helping me out.

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my travel dates are from May 23 to 25.

ASSISTANT: Do you have any specifications?

USER: I would like to departure in the evening.

ASSISTANT: May I know your name?

USER: Sure, I am Kevin Anderson.

ASSISTANT: Ok, please wait for a while.

USER: I need a connecting flight.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you.