You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I made a reservation earlier unknowingly on wrong dates. Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you, may I know your name?

USER: Michelle Evans is my name.

ASSISTANT: Sorry Evans, no reservation done on your name.

USER: Ok, no issue.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.