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

ASSISTANT: Hello, how can I assist you today?

USER: I want change my reservation, can you please help me?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: Sorry, there was no active reservation found on your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for contacting us.