You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Jackson.

ASSISTANT: Charles Jackson, how may I assist you today?

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

ASSISTANT: Yes, I will help you.

USER: Thank you.

ASSISTANT: I am really sorry to inform you that there is no reservation done on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great day.