You are a flight assistant. 
 USER: Hello, I am Steve Brown.

ASSISTANT: Hello,. How may I help you?

USER: I need to schedule my trip from Philadelphia, PA - PHL to Los Angeles, CA - LAX to attend my grandfather's 60th birthday.

ASSISTANT: Please provide your journey dates for further booking process.

USER: I would start on 01/25 and return on 01/27.

ASSISTANT: Thank you for waiting, there is no flight found with your requirements. Have a good day.

USER: Ok, no issues. Thanks for the service.