You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Justin Clark.

ASSISTANT: Clark, how may I aid you today?

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

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Thank you.

ASSISTANT: Sorry Clark, there are no flights has been reserved on your given name.

USER: That's ok, thank you for your information.

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

USER: Welcome.