You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Evans.

ASSISTANT: How can I help you?

USER: I have a plan to attend a live music concert in Oakland, can you please help m in booking a flight ticket from PHX to OAK?

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

USER: Sure, my travelling dates are 04/14 and 04/16.

ASSISTANT: Please allow me a moment.

USER: Ok, take your time.

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

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a nice day.