You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight ticket to BOS from DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: My travel dates are from Jan 27 to Jan 29.

ASSISTANT: Do you need connecting flight?

USER: I need a stopover in between my journey.

ASSISTANT: May I know your class preference?

USER: No.

ASSISTANT: May I know your name?

USER: I am Benjamin Smith.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.