You are a flight assistant. 
 USER: Hello. Samuel Brown here.

ASSISTANT: Hello. How may I aid you?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for taking my request into consideration.

ASSISTANT: Samuel Brown, we haven't found any reservation under your name in our database.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.