You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you.

USER: I am Lisa Adams. I want to go Denver next week for attending a seminar there, can you please book a flight ticket from New York?

ASSISTANT: Sure, I will help you out.

USER: Thanks.

ASSISTANT: May I know your travelling dates please.

USER: My departure date is 03/27 and also please confirm my return ticket also on 03/29.

ASSISTANT: Can I know your airport codes please?

USER: I want to fly from JFK and destination airport is DEN.

ASSISTANT: Ok, please wait a moment. Sorry, there are no flights found.

USER: Oh! I am very disappointed with that.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.