You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Eric Roberts. I want to change my reservation due to sudden change in my trip schedule.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flight reservation found with your name.

USER: Okay, thank you for informing.

ASSISTANT: Thank you for opting us.