You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Jennifer Green, I would like to change my recent reservation because of some personal work, can you help me with this?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found on your name in our database.

USER: That's fine, thanks for your information anyways.

ASSISTANT: Thank you for approaching us.