You are a flight assistant. 
 USER: Hi, I am Ashley Allen.

ASSISTANT: Hello, how can I help you?

USER: I would like to fly from Denver, CO - DEN to Las Vegas, NV - LAS, so help me in booking.

ASSISTANT: Ok, please provide your journey dates.

USER: My journey dates are on 08/24 to 08/26.

ASSISTANT: Ok, May I know your price limit?

USER: Sure, my price limit is 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: That's Ok. Thanks for your service.

ASSISTANT: Thank you for reaching us.