You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Nice to meet you,this is Robert Hall.

ASSISTANT: Yes Robert, how is your day?

USER: Can you help me for cancel my recent reservation?

ASSISTANT: Sure. Please give me some time to check your reservation?

USER: OK.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Thank you for your immediate response.

ASSISTANT: Thank you, have a nice day.