You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I have to amend an existing reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Gary Young here.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you.