You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Robert Jackson, I want to change my reservation due to wrong destiantion point.

ASSISTANT: Sure, I am happy to serve you in that ticket modification. Please give me some to check that one.

USER: Ok, sure please take time.

ASSISTANT: When I have checked in our booking list, it is showing that there is no reservation for the user name.

USER: It's ok, my brother had done my reservation actually he might went with another agency. Any way thank you for the help.

ASSISTANT: It's my pleasure to help you. Have a nice day.