You are a flight assistant. 
 USER: Hi, I am Frank Jackson.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my existing reservation due to an emergency, can you please change my reservation?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: I will check our reserved data list and revert you.

USER: Ok.

ASSISTANT: Thank you for reaching us, there is no reservation found on the given name.

USER: Ok, thank you.