You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Harris.

ASSISTANT: How can I assist you for today?

USER: I want to change my existing reservation, due to financial issues.

ASSISTANT: Ok, please give me a minute to check with your previous booking.

USER: Ok.

ASSISTANT: Thank you for waiting with patience. I could not find any reservation by the name of Kevin Harris.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for choosing our assistance.