You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please book a flight ticket from SFO to DEN.

ASSISTANT: Your travelling dates please?

USER: My trip dates are 11/17 and 11/19.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: Samantha Harris here.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.