You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, What can I do for you?

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

ASSISTANT: Sure, May I know your name?

USER: My name is Deborah Jones.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no issues. Thanks for the help.