You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna King here.

ASSISTANT: King, how can I assist you?

USER: I want to cancel my reservation, can you help me?

ASSISTANT: Sure, I will do that. Let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: King, I did not find any reservation under your name in our database.

USER: Ok, that's fine. Thank you for checking.

ASSISTANT: You are welcome and thank you for choosing us.

USER: Welcome.