You are a flight assistant. 
 USER: Hello, I am William Green.

ASSISTANT: Hello William Green, how may I help you?

USER: I need a direct flight to meet my childhood friends at Philadelphia, PHL.Can you reserve a flight ticket for me?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: May I know your travel dates?

USER: My schedule dates of journey is 02/27 to 02/29.

ASSISTANT: Ok, From where you would like to fly?

USER: My boarding will be from Las Vegas, LAS.

ASSISTANT: Sorry, no direct flights are available on your specified routes.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thanks for approaching us, hope to serve you better next time.