You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Thomas here.

ASSISTANT: In which way I can assist you at this moment?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I am mirthful to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that there is no previous reservation on your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting to our services, have a great day.