You are a flight assistant. 
 USER: Hello. I am Dennis Mitchell.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Anyways, thank you for your help.