You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Christine Jones.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

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

ASSISTANT: Thank you for approaching us.