You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I serve you?

USER: I am Paul Davis. Please book a ticket from AZ-PHX to NV-LAS.

ASSISTANT: Sure, May I know your journey dates?

USER: Journey dates are from 03/25 to 03/27.

ASSISTANT: Sorry, No flights found with your dates.

USER: Thanks.