You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Brian Wilson. I just want to change my recent reservation, due to my earlier reservation in a wrong date unknowingly. Can you help me with that?

ASSISTANT: Sure,  I am here to assist you. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for choosing us, Have a great day!.