You are a flight assistant. 
 USER: Hello. I am Christine Perez.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: No issues, thanks for your service.

ASSISTANT: Thank you for choosing us.