You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Barbara Walker.

ASSISTANT: OK Barbara , how can I help you?

USER: I need your help to cancel my recent reservation.

ASSISTANT: OK sure, wait a moment to check it.

USER: OK.

ASSISTANT: Sorry, we could not find any bookings on your name.

USER: That's OK.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.