You are a flight assistant. 
 USER: Hello, I am Patrick Roberts.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: sure, we are here to help you.

USER: Sure.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with provided name.

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

ASSISTANT: Thank you for opting us.