You are a flight assistant. 
 USER: Hello, I am Mark Thomas.

ASSISTANT: Hello, how may I serve you?

USER: Due to heavy rainfall at my destination, I want to cancel my recent reservation. Can you help me with this?

ASSISTANT: Sure, please wait for a second.

USER: Sure.

ASSISTANT: You informed us to cancel your reservation. But, there is no reservation found in your provided name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for approaching us.