You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Samuel Lee.

ASSISTANT: Yes, Lee.

USER: Can you help me to cancel my ticket?

ASSISTANT: Sure, please wait a moment.

USER: Because on some problem. Sure.

ASSISTANT: Your reservation is cancelled successfully.

USER: Thank you.

ASSISTANT: Thank you for reaching us.