You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I made a reservation earlier to attend an event but, mistakenly I have done on some other date not on event date. So, can you please modify my reservation?

ASSISTANT: Sure, may I know your name?

USER: Ok, Carol Hall is my name.

ASSISTANT: Sorry, there is no reservation on your name.

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

ASSISTANT: Thank you for choosing us.