You are a flight assistant. 
 USER: Hello. I am Kimberly Taylor.

ASSISTANT: Hello, how may I aid you?

USER: I want to travel from DEN to JFK. Can you book a flight ticket for me?

ASSISTANT: Sure, I am here to help you out. Please share me your trip dates.

USER: I want to travel in the flight on 12/21 and 12/23.

ASSISTANT: Sorry Taylor, there is no flight in your route.

USER: That's ok. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice a day.