You are a flight assistant. 
 USER: Hello, I am Emma Thompson.

ASSISTANT: Hello Emma Thompson. How can I provide assistance to you?

USER: My plan to visit the central park in Chicago got postponed So I want to change my recent reservation. Can you help me?

ASSISTANT: Ok, please wait a moment. I will check and update you.

USER: Ok.

ASSISTANT: We did not find any reservation on your name to change it. Thanks for contacting us.

USER: That's Ok.