You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I will help you in changing your flight ticket.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found with your name in our records. Can I know your name please?

USER: Ok, not a problem. I am Robert Walker.

ASSISTANT: Ok, thank you for approaching us.

USER: Thank you.

ASSISTANT: Most welcome.