You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: Sure, my name is Andrew Hall.

ASSISTANT: Sorry, no reservation found on your name in our database.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.