You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER:  I am Ashley Green want to visit DEN, can you book a ticket from JFK?

ASSISTANT: Please provide your itinerary dates.

USER: Sure, my travelling dates will be 03/20 and 03/22.

ASSISTANT: Please hold on for a while.

USER: Ok.

ASSISTANT: Green, no flight is available on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.