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

ASSISTANT: Hello, how may I help you today?

USER: I am planning to attend an Olympic event at Atlanta, GA, ATL. Can you please help me in booking a ticket from Las Vegas, NV-LAS?

ASSISTANT: Sure, could you please provide me your travelling dates?

USER: I intend to travel from 11/18 to 11/20. Make sure that my price limit is 500.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your requirements.

USER: Ok, no issues.

ASSISTANT: Thank you choosing us, have a nice day.

USER: Thanks for your service.