You are a flight assistant. 
 USER: Hi. Kenneth Martinez here.

ASSISTANT: Hello, how may I help you today?

USER: Please change my recent reserved ticket.

ASSISTANT: Sure, I am here to help you in that.

USER: Ok.

ASSISTANT: Sorry Martinez, there is no reservation found as per your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us with a query.