You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book my ticket from Denver, DEN to BOS. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travel dates are from Dec 17 to Dec 19.

ASSISTANT: Ok, please share your name.

USER: Sure, myself Daniel Lopez.

ASSISTANT: May I know your connection limit?

USER: Sure, I need a connecting flight in my journey.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your service.