You are a flight assistant. 
 USER: Hello, Charles Turner here.

ASSISTANT: Hello. How can I help you?

USER: I have to meet my business partner in Las Vegas. Please book my ticket from PHL to LAS.

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 01/24 and 01/26.

ASSISTANT: There is a direct flight for your journey by UA airlines, can I book it for you?

USER: Please book it.

ASSISTANT: Your booking is done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.