You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Michelle King. I would like to change my existing ticket.

ASSISTANT: Sure, please wait for a while.

USER: Sure, please take your time.

ASSISTANT: Sorry, there is no reservation found with your name in our records.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: My pleasure.