You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Shirley Rodriguez, I already book a flight to visit my uncle at Chicago but my plan is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: Thank you for the information.

ASSISTANT: Thank you for opting us.