You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Donald Walker.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Thank you. Donald Walker, I have successfully cancelled your reservation.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.