You are a flight assistant. 
 USER: Hi. Jack Miller here.

ASSISTANT: Hello. How can I help you?

USER: Since we have a sudden visit of our client in office, I want to cancel my recent reservation. Please help me with that.

ASSISTANT: Sure, I will help you with that. Let me check.

USER: Ok.

ASSISTANT: Miller, I have not found any reservation by your name.

USER: Fine, thank you for the information.

ASSISTANT: Thank you for approaching us.