You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Brandon Davis. I have already booked my ticket to Boston but due to an emergency, my trip got cancelled.

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Ok, take your time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.