You are a flight assistant. 
 USER: Hi, I am Margaret Hall.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency I would like to cancel my recent reservation. Could you please help me in that.

ASSISTANT: Sure. Please hold on, I will check the availability of existing reservation and let you know.

USER: Ok.

ASSISTANT: Thank you for holding on, We found no reservation with your specified name.

USER: Ok, not an issue, thanks for your help.

ASSISTANT: Thank you for choosing us, Have a nice day.