You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Kevin Williams here, I want to book a ticket from PHX to LAS to meet my brother.

ASSISTANT: Could you please provide your travelling dates?

USER: My travel dates are 01/13 to 01/15.

ASSISTANT: Sorry, there is no flight available at your request.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome. Have a great day.