You are a flight assistant. 
 USER: Hello. I am Frank Davis.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Owing to an emergency, I need to cancel my recent reservation which has done earlier. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: OK.

ASSISTANT: We are sorry to inform you that, we did not find any reservation with this name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us. Have a good day.

USER: Thank you for your time.