You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in booking a flight ticket from DEN to BOS by the name David Adams?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are from Aug 20 to Aug 22.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: Ok, No issues. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.