You are a flight assistant. 
 USER: Hello,. I am Helen Adams.

ASSISTANT: Hello, how can I help you?

USER: Due to postpone of my exams I need to cancel my reservation. Could you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.