You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: I am Samantha Jones. My family tour trip got postponed, so I want to change an existing reservation. So please help me in changing the reservation.

ASSISTANT: Sure, we are here to help you. Please standby.

USER: Sure.

ASSISTANT: Thank you for your patience, we are sorry to inform you that there was no reservation found on your name.

USER: Not an issue. Thank you for your help.

ASSISTANT: Thank you for availing us.