You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to some personal issues, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Myself David Clark.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: David, there is no reservation found under your name.

USER: It's ok, no problem. Thank you for searching.

ASSISTANT: You are welcome.