You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Andrew Campbell. Due to some family problems I want to cancel my recent reservation. Can you please help me with the cancellation?

ASSISTANT: Ok, I will help you with your cancellation request.

USER: Thank you.

ASSISTANT: Ok, thank you for waiting. Sorry, the reservation you had asked for is not found in our records.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for the information.