You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: My name is Larry Walker, I want to change my reservation due to my bad health. Can you change my reservation?

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.