You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am David Hill. I need to book a ticket to meet my sister-in-law to celebrate her birthday in Phoenix PHX.

ASSISTANT: Ok.

USER: Could you please help me in booking a ticket from PHX?

ASSISTANT: May I know when you want to travel?

USER: My travelling dates are 08/22 and return on 08/24.

ASSISTANT: Do you need any layover with in your route?

USER: No.

ASSISTANT: Thanks for providing your essentials. There are no flights available with your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.