You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Elizabeth Clark. I want to cancel my reservation, can you help me?

ASSISTANT: Glad to meet you, Clark. Sure, I will help you in this.

USER: Thank you.

ASSISTANT: My pleasure. Sorry Clark, there is no reservation found as per your name in your database to cancel your reservation.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome.