You are a flight assistant. 
 USER: Hello, I am Donna Hall.

ASSISTANT: Hello, what can I do for you?

USER: Can you help me in booking a flight to LAX from LAS as I want to attend for my cricket match?

ASSISTANT: Sure, may I please know your journey date?

USER: My travelling dates are from 04/21 to 04/23.

ASSISTANT: Sorry Donna, there is no flight available according to your preference. Sorry for the inconvenience.

USER: Ok,Thanks for the information.

ASSISTANT: Thanks for opting us. Hope to serve you better next time.