You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my reservation as my plan to go for an adventure trip got postponed. Can you help me?

ASSISTANT: Sure, ,may I know your name.

USER: I am Robert Miller.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok fine, thanks for your response.