You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me to change my active reservation as my meeting was changed?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Gary Lopez.

ASSISTANT: Please wait for a moment, while I checked for the reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for visiting, we hope see you again.