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

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in changing my existing reservation as my plan to attend a flower festival got postponed?

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for availing us.