You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my existing reservation as my college function got postponed, Can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: Carol Robinson here.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.