You are a flight assistant. 
 USER: Hello, I am William Carter.

ASSISTANT: Hello, how can I amend you?

USER: I want to book a flight ticket to New York, NY - EWR to overview the city with my best friend.

ASSISTANT: Ok, when you have planned to travel?

USER: Can you help me for booking from Denver, CO - DEN? Sure, my planned dates are on 03/27 to 03/29.

ASSISTANT: May I know your fare limit?

USER: Sure, I can afford up to 500.

ASSISTANT: Ok. Sorry, no flights found to your preferred locations.

USER: Ok, thanks for your information.

ASSISTANT: Thanks for connecting with us.