You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: I am Benjamin Lee. I want to change my existing reservation due to some issues, can you please help me with that/.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for availing us.