You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your good name, Please?

USER: I am Joshua Martinez, my planned visit to meet my childhood friends got postponed, so I want to change my existing reservation. Could you please help me in changing my existing reservation.

ASSISTANT: Sure. We are very sorry to inform you that, There is no reservation found on Joshua Martinez.

USER: Ok, no issues.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation. Have a nice day.

USER: Thanks for your information.