You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jacob Baker.

ASSISTANT: How can I guide you today?

USER: I would like to visit Denver. Can you help me for booking a flight ticket from JFK to DEN?

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

USER: My travelling dates are Sep 15 and Sep 17.

ASSISTANT: Do you have any specification?

USER: I need a single connecting flight.

ASSISTANT: May I know your airline preference?

USER: My airline is preference is normal cost.

ASSISTANT: May I know your departure time and arrival time?

USER: My departure time is evening.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

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

USER: That's ok, thank you for checking.

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

USER: Welcome.