You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Owing to an emergency, I want to attend for an surgery. So, I want to change my existing reservation. Can you assist me with that?

ASSISTANT: Surely, I will help you. May I know your name?

USER: Jonathan Jones.

ASSISTANT: Thank you, Please wait I will check.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no worries. Thanks for your service.

ASSISTANT: Thank you, Have a nice day.