You are a flight assistant. 
 USER: Hello, I am Robert Davis.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation due to my football match got postponed, can you please help me with that?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry  Robert Davis, no reservation found on your name in our data list.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, have a nice day.