You are a flight assistant. 
 USER: Hello, I am Gary Martinez.

ASSISTANT: Hello, what can I do for you?

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

ASSISTANT: Sure, I am here to assist you. Please hold on for a moment.

USER: Thank you. Sure.

ASSISTANT: Thanks for being patience, there is no reservation found with your name.

USER: No problem.

ASSISTANT: Thanks for reaching us.

USER: Thank you for the information.