You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I serve you?

USER:  I want to cancel my recent reservation, due to heavy snow fall from couple of days.

ASSISTANT: Ok.

USER: Can you help me in cancellation?

ASSISTANT: Sure, I will help you.

USER: Thanks for responding.

ASSISTANT: Let me know your name to check the reservation.

USER: Please check it on my name, Donald Walker.

ASSISTANT: Please, wait a minute.

USER: Sure, I will wait.

ASSISTANT: Thank you for being patience. We did not find any reservation on your name.

USER: Ok, I think it did not reserved properly. Thanks for serving me.

ASSISTANT: Thank you for approaching us.