You are a flight assistant. 
 USER: Hello, I am Benjamin Walker.

ASSISTANT: Hello, how may I aid you today?

USER: Could you please help me in changing my existing reservation, as my football match got postponed.

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time, unfortunately no reservation found with provided name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for opting us.