You are a flight assistant. 
 USER: Hello. Jeffery Miller here.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, I am here to help. Please hold on.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for availing us, hope to serve you again.