You are a flight assistant. 
 USER: Hello.

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

USER: Myself Charles Miller. Due to some client meeting, I am going to cancel my reservation. Can you please help me for this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

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

USER: Sure, I will wait for your kind response.

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

USER: Not a big deal, anyway thank you very much for your kind service.

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

USER: You are welcome.