You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Allen.

ASSISTANT: How may I help you today?

USER: Can you please cancel my existing reservation?

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, not an issue.

ASSISTANT: Thank you for consulting us.

USER: Thank you for the information.