You are a flight assistant. 
 USER: Hello, I am Virginia Hill.

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

USER: I am planning to celebrate my birthday in Denver, so please book a flight ticket from IAH to DEN.

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

USER: My departure day is Jan 20, return day is Jan 22.

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

USER: I need a connecting flight.

ASSISTANT: Do you have any class preferences?

USER: No, I am comfortable with any class.

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

USER: Ok, proceed to booking.

ASSISTANT: Your booking is confirmed with flight number 1005 in economy class.

USER: Thank you for your help.

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