You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Owing to an emergency, I want to cancel my recent reservation. Can  you help me?

ASSISTANT: Sure, I am here to help you. May I know the name on which the ticket has been reserved?

USER: Thank you. Yes, I am John Williams.

ASSISTANT: Sorry John, there are no flights reserved on your given name.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.