You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a ticket from BOS to DCA. Could you book a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Travel dates are Apr, 24 and Apr, 26.

ASSISTANT: Do you have any specifications?

USER: I would prefer direct flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Kevin Evans.

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

USER: Thank you.