You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need an immediate help with my flight ticket modification process, can you please help me with that one?

ASSISTANT: Sure, may I know your name to proceed?

USER: Thank you for accepting my request and my name is Gregory Lewis.

ASSISTANT: Please wait for a moment to check your details. Sorry to say, no reservation found on your name.

USER: Ok, that's fine. Thank you for checking my previous flight ticket booking.

ASSISTANT: Thank you for reaching us.