You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: My name is Jonathan Mitchell and I want to change the reservation. Can you please help me?

ASSISTANT: Sure, please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Sorry to say that, there was no reservation found on your specified name to change it.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.