You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carol Baker. I would like to travel from PHX to DEN. Can you please help me to book a ticket?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates will be on May 1 to May 3.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Welcome, have a nice day.