You are a flight assistant. 
 USER: Hello, I am Helen Hall.

ASSISTANT: Hello, how can I guide you for today?

USER: I would like to travel from DEN to JFK. Can you please help me to book a ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to start on Dec 22 and return on Dec 24.

ASSISTANT: Do you have any class preferences?

USER: No, I am comfortable with any class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Please make sure that my return time should be evening.

ASSISTANT: There is a flight with ticket fare 100 in Spirit airlines with a stopover. Is it ok for you?

USER: Ok, you can proceed to booking.

ASSISTANT: Your booking is confirmed with flight number 1012 in economy class.

USER: Thank you.

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