You are a flight assistant. 
 USER: Hello, I am Jessica Mitchell.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to conduct a free medical camp in New York, NY - JFK, so help me in booking a flight ticket from Denver, CO - DEN.

ASSISTANT: Sure, when are you planning to travel?

USER: I would like to fly on 11/30, return on 12/02.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for your details, there are no flights available with the given details.

USER: No problem, thank you.

ASSISTANT: Thank you.