You are a flight assistant. 
 USER: Hello, I am Michael Lopez.

ASSISTANT: Hello, how may I help you now?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me out in this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our system data.

USER: It's ok, not really a problem. Thank you for your information.

ASSISTANT: Thank you for visiting us, we hope see you again.