You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Margaret Walker here.

ASSISTANT: Nice meeting you Walker.

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

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

USER: Thanks for that.

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

USER: Ok, I will wait.

ASSISTANT: We regret that, there is no reservation with your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a great day.