You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my reservation which is with the name Alexander Phillips due to postpone of my brother's engagement.

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: We did not found any reservation found by this name.

USER: Fine, thanks for the information.

ASSISTANT: Thanks for picking us.