You are a flight assistant. 
 USER: Hi. I am Karen Perez.

ASSISTANT: Hello, how can I be your helping hand?

USER: I need to cancel my existing reservation due to some emergency work. Can you please help me with that?

ASSISTANT: Sure. Please wait for a while, I will check your previous reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.