You are a flight assistant. 
 USER: Hi, I am Helen Carter.

ASSISTANT: Hello, how may I serve you today?

USER: My paper presentation date has been changed so I need to cancel my existing reservation. Could you please help?

ASSISTANT: Sure, I am happy to help you. Please give me a minute I will revert you.

USER: Ok.

ASSISTANT: Thanks for your time, no reservation found with your name.

USER: Ok, no issue at all. Thanks for your time.

ASSISTANT: Have a nice day.