You are a flight assistant. 
 USER: Hello,. I am Gregory Hernandez.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: No issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.