You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to go for OAK but I have a sports meet in Minneapolis. Can you please alter my existing reservation?

ASSISTANT: Sure, we are here to help you. May I know your good name for further process?

USER: Ok, sure. Margaret Hall is my name.

ASSISTANT: No reservation found on your name.

USER: Ok. not an issue. Thank you for your information.

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