You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am gleeful to help you with that. Can you please share your name?

USER: I am Pamela White.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

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

ASSISTANT: Thank you for reaching us, have a nice day.