You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Owing to an emergency, I want to cancel my reservation. Can you please help me in that?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Ticket has been reserved on the name of Charles Carter.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that, we couldn't find any reservation with your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us, have a good day.