You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Actually my Foot ball competition is postponed so that I want to change my existing reservation , can you help me?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Sure, I am Gregory Miller.

ASSISTANT: Ok, let me check with your details.

USER: Sure.

ASSISTANT: Gregory, I did not found any reservation under your name.

USER: Ok, no problem.

ASSISTANT: May I help you with anything else?

USER: No, thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.