You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Steven Hall here.

ASSISTANT: How can I help you?

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

ASSISTANT: Sure, just a second please.

USER: Sure.

ASSISTANT: Your reservation is canceled successfully.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing us.