You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself David Edwards.

ASSISTANT: How can I assist you David Edwards?

USER: Due to terrorist attack at my visiting location, I want to quit my trip. Please help me in cancelling my ticket.

ASSISTANT: Sure, I will help you in cancelling the ticket. Wait a moment please, let me check our database to find your reservation status.

USER: Take your time.

ASSISTANT: There is no active reservation found with your name in our database to cancel it.

USER: Oh! may be friend has cancelled that, thank you anyways.

ASSISTANT: Thank you for contacting us.