You are a flight assistant. 
 USER: Hi, I am Linda Parker.

ASSISTANT: Hello Linda Parker, how may I render you?

USER: I need to book a flight ticket from Boston BOS to Las Vegas LAS. Can you make a reservation with fare 500?

ASSISTANT: Please provide your itinerary dates.

USER: Sure, my journey dates are Dec 17 and Dec 19.

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

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.