You are a flight assistant. 
 USER: Hello, I am George White.

ASSISTANT: Hello, how may I aid you?

USER: I want to reschedule my recent reservation as my joining date got postponed. Can you help me in booking?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found by this name.

USER: Ok, no issues. Thanks for your quick response.

ASSISTANT: Thanks for contacting us, have a nice day.