You are a flight assistant. 
 USER: Hello, Michael Smith here.

ASSISTANT: Hello Smith. How can I help you at this moment?

USER: I got to know that the service of UA airline is not good, so I want to cancel my recent reservation.

ASSISTANT: Ok, I will help you to cancel.

USER: Thank you.

ASSISTANT: Smith, I did not find any reservation with your name.

USER: That's really sad. Ok, thank you for your information.

ASSISTANT: Anything else to help you.

USER: No, If I want any help I will get back to you.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you for your service.

ASSISTANT: Have a good day.