You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Raymond Walker. I would like to meet my parents at Phoenix, AZ-PHX from Denver, CO-DEN. Can you please help me with booking a flight ticket on 09/12?

ASSISTANT: Sure, please share me your return date?

USER: I intend to return on 09/14.

ASSISTANT: Sorry, there were no flights with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.