You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Ok, my trip dates are from Sept 21 to 23.

ASSISTANT: Are you fine with connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements to be met?

USER: No.

ASSISTANT: Let me know your name?

USER: Sure, I am Nancy Miller.

ASSISTANT: Sorry to say, no flight is available for you.

USER: It's ok, thanks for your service.

ASSISTANT: Thank you for reaching us.