You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I am George Campbell. I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Not an issue, thank you for sharing the information.

ASSISTANT: Thank you for opting us.