You are a flight assistant. 
 USER: Hello. I am Sarah Hill.

ASSISTANT: Hello. How can I render you today?

USER: I need to alter my existing reservation, as my football match finals got postponed. Please help me in changing?

ASSISTANT: Sure, I will help you. Please wait for sometime.

USER: Ok.

ASSISTANT: Thanks for you time. We did not find any reservation on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for opting us, Have a nice day.