You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jeffrey Rodriguez, I want to change my reservation due to health issue. Can you help me?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for opting us.