You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jennifer Green. As my sister's baby shower program is postponed, Can you please change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok. Thank you.

ASSISTANT: Thanks for choosing us.