You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Because of some problems, I just want to cancel my recently done reservation. Can you please help me in this?

ASSISTANT: Sure, can I know your good name?I will check your reservation details with your name.

USER: Sure, my name is Jennifer Miller.

ASSISTANT: please hold on for a while, I will go through your reservation details.

USER: Sure.

ASSISTANT: Sorry Miller, I did not found any reservation showing active in our database for cancelling your reservation, once please look if it might have cancelled previously.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.