You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: Can you help me to change my existing reservation?

ASSISTANT: Can I know your good name?

USER: I am Gregory Walker.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, there is reservation found with the given name.

USER: No issues, thank you for the checking.

ASSISTANT: Thank you.