You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Walker.

ASSISTANT: How may I help you today?

USER: Owing an emergence, I want to cancel my recent reservation. Can you please help me with it?

ASSISTANT: Sure, please allow me a moment, let me check with your details.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your given name.

USER: No problem, thanks for the help.

ASSISTANT: Thank you for reaching our service.