You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, May I know your name please?

USER: I am Brandon Wilson.

ASSISTANT: Hello, Brandon Wilson, How can I help you?

USER: As part of my schedule, I made a reservation earlier to attend live music concert. But, due to some health issues I was unable to attend. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your time. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, not an issue. Thanks for your quick response.

ASSISTANT: Thank you, For making an inquiry with us regarding changing process.