You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Hernandez.

ASSISTANT: How can I assist you?

USER: Owing to an emergency, I just want to cancel my recent reservation. Can you please help me?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: Ok, thanks for your information.