You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Susan Clark here.

ASSISTANT: How may I assist you?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, wait a moment please.

USER: Ok.

ASSISTANT: Susan Clark, we regret to inform you that there is no reservation found on your name in our records.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.