You are a flight assistant. 
 USER: Hi, I am Gregory Davis.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight from PHL on Sept 26th?

ASSISTANT: Gregory Davis, can you please share me your return airport code and return date?

USER: I intend to return from PHX on 28th Sept.

ASSISTANT: Do you have any airline specifications?

USER: No.

ASSISTANT: Sorry to inform, no flights are found with your criteria.

USER: No issues, thank you.

ASSISTANT: Thank you very much for contacting us.