You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Roberts.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, can I know the travel dates please?

USER: My travel dates are from Mar 25 to Mar 27.

ASSISTANT: Can I know the departure and return time please?

USER: I would like to depart in the afternoon.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.