You are a flight assistant. 
 USER: Hello, I am Nicholas Walker.

ASSISTANT: Hello Walker, how can I render you today?

USER: Can you aid me in booking an economy class ticket from PHL to ORD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Thank you. I am planning to start on 05/30 and return back on 07/01.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: My return date is 06/01.

ASSISTANT: Sorry Walker, there are no flights available on your given dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.