You are a flight assistant. 
 USER: Hello. I am Sharon Young.

ASSISTANT: Hello, how can I amend you?

USER:  I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, I will help you. Please stand by.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation done earlier with your name to change.

USER: Not an issue. Thanks for your support.

ASSISTANT: Thank you for choosing us.