You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what kind of service you are expecting from us?

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

ASSISTANT: Sure, I am mirthful to help you. To proceed further, may I know your good name please?

USER: I am Kathleen Smith.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being so patience. I have checked in reservation list to change your reservation, but could not find any reservation with your name.

USER: It's not a problem. Thank for your information.

ASSISTANT: Thanks for opting us, have a good day.