You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Robert Martin and I just want to cancel my reservation due to my appointment got cancelled. Can you help me with this?

ASSISTANT: Sure, we will help you in cancelling your reservation.

USER: Sure.

ASSISTANT: Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, there is no reservation found on your name Robert Martin in our database.

USER: Ok, no issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.