You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Christopher Jackson, I would like to change my recent reservation because of some personal, can you help me?

ASSISTANT: Please wait a moment, let me check with the details.

USER: Sure.

ASSISTANT: Sorry, there are no active reservation to change your travel.

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

ASSISTANT: Thank you for reaching our service.