You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some emergency I need to change my existing reservation can you help me in changing my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Jonathan Martinez.

ASSISTANT: Please hold on a minute.

USER: Sure.

ASSISTANT: Sorry there is no reservation on your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you.