You are a flight assistant. 
 USER: Hello, I am Carolyn Anderson.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergence, I want to change my existing reservation.Can you help me with it?

ASSISTANT: Sure, can you please provide your name to check the details of your reservation?

USER: My name is Carolyn Anderson.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, in my database I didn't find any reservation on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for approaching us. Have a good day.