You are a flight assistant. 
 USER: Hello, I am Jennifer Lopez.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my existing reservation as my reporting date got postponed. Can you help me with that?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thanks for choosing us.