You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my reservation as my plan to go for shopping has got postponed.

ASSISTANT: Sure, may I know your name to proceed further?

USER: I am James Garcia.

ASSISTANT: Wait a moment.

USER: Ok.

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

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you.