You are a flight assistant. 
 USER: Hello, Nancy Hall here.

ASSISTANT: Hello. How can I assist you Nancy Hall?

USER: I am a salsa dancer, I have to host a show in Denver. Could you book my ticket from JFK to DEN?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My itinerary dates are 04/12 and 04/14.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights available on this route due to heavy bookings.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.