You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a flight from DCA to BOS, can you help me out?

ASSISTANT: Your travelling dates please?

USER: My trip dates are from Aug 27th till Aug 29th.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a direct flight.

ASSISTANT: Any thing else.

USER: I need a business class flight.

ASSISTANT: May I know your name please?

USER: Myself Donna Adams.

ASSISTANT: I am sorry no flight found on your route.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.