You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I have to go New York for attending a summit there, can you please book a flight ticket from Las Vegas?

ASSISTANT: Sure, help me with the travelling dates.

USER: My departure date is 02/20 and please book my return ticket also on 02/22.

ASSISTANT: May I know your airport codes?

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

ASSISTANT: May I know your name?

USER: Sure, my name is Patrick Collins.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Oh! It's ok no problem, I will go with another airline.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.