You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Gary Lee here. Can you alter my reservation?

ASSISTANT: Sure Gary. Please wait, I will check your previous reservation.

USER: Ok.

ASSISTANT: Sorry Gary, no reservation found under your name in our database.

USER: Anyways, thank you for searching.

ASSISTANT: Thank you, have a good day.