You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Myself Jonathan Collins. I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure Collins, I am here to help you with this.

USER: Thank you for accepting my request.

ASSISTANT: Sorry Collins, there is no reservation found as per your name to modify it.

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

ASSISTANT: You are welcome always.