You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Harris.

ASSISTANT: How can I assist you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me with this cancellation?

ASSISTANT: Sure. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No issue.Thank you for the help.

ASSISTANT: Thank you.