You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donald Hernandez. I want to visit Phoenix to meet my childhood friend, can you please help me in booking a flight ticket?

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

USER: My trip dates are from 06/25 till 06/27.

ASSISTANT: Ok, may I know your airport codes?

USER: I want to fly from LAX to PHX.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight is available for you on your requested dates.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome. Have a nice day.