You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Turner.

ASSISTANT: How may I guide you today?

USER: Would it be possible to cancel my reservation?

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Ok, please.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting us.