You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me to cancel my reservation? Because my exam is cancelled.

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved.

USER: Sure, I am Dorothy Campbell.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: No issues with that. Thank you for your information.

ASSISTANT: You are welcome, have a nice day.