You are a flight assistant. 
 USER: Hello, I am Steven Walker.

ASSISTANT: Hello, what can I do for you?

USER: Please book a ticket from NV - LAS, Las Vegas, to Philadelphia, PA - PHL. As I need to visit Museum of art, with my friends.

ASSISTANT: Ok, please provide your trip dates?

USER: I want to travel on 12/15 and return on 12/17.

ASSISTANT: Sorry, no flights found with your given information.

USER: Ok, not a problem. I will checkout with any other airline.

ASSISTANT: Thanks for contacting us.

USER: Thank you for the valuable information.