You are a flight assistant. 
 USER: Hello, I am Margaret Wright.

ASSISTANT: Hello, how may I help you at this moment?

USER: Due to an emergency, I would like to cancel my recent reservation.

ASSISTANT: Sure, please wait for an moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no ticket is showing under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.