You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, please share your good name?

USER: My name is Raymond Carter.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for your waiting, there is no active reservation found with the given name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you.