You are a flight assistant. 
 USER: Hello, I am Charles Gonzalez.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.