You are a flight assistant. 
 USER: Hello, Andrew Garcia here.

ASSISTANT: Hello, how can I assist you?

USER: I planned to attend for an interview in LGA, can you please help me to book a flight ticket from DEN?

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

USER: I prefer to travel on 12/24 and 12/26.

ASSISTANT: Andrew Garcia, there are no flights available on your provided dates due to heavy bookings.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your informaton.