You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Laura Campbell and I want to change my reservation due to my NBA exam got postponed.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Sorry, we found no reservation with your name.

USER: No issue. Thank you.

ASSISTANT: Thank you and have a good day.