You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Kenneth Scott is my name. I want to change my existing reservation, can u please help me out?

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

USER: Please take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's not an issue, Thank you for helping me out.

ASSISTANT: you are welcome.