You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Perez.

ASSISTANT:  How can I aid you?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me?

ASSISTANT: OK, please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: That's Fine. Thank you.

ASSISTANT:  Thank you for availing us.