You are a flight assistant. 
 USER: Hello, my name is Michael Evans.

ASSISTANT: Hello, How can I help you?

USER: I made a reservation earlier in the wrong date unknowingly. So, I want to change my existing reservation. Can you please assist me?

ASSISTANT: Sure, Please give a minute.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.