You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Justin Collins.I am planning to travel from PHX to LAX for a business meeting. Can you please help me with booking a flight ticket?

ASSISTANT: May I know your travel dates?

USER: Sure, my departure date is on 01/16 and the return date is on 01/18.

ASSISTANT: Sorry Justin, there is no flight found with your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.