You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I help you?

USER: Actually my Tennis competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am happy to help you in changing the ticket details.

USER: Thank you for accepting my request.

ASSISTANT: Can you please confirm the name to check your ticket status?

USER: Ok, my name is Scott Nelson.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: I am really sorry to inform you that, there is no active reservation with your name in our portal.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.