You are a flight assistant. 
 USER: Hello, I am Angela Walker.

ASSISTANT: Hello, how may I help you?

USER: Due to some emergency I need to change my existing reservation. Can you help me in changing my reservation?

ASSISTANT: Sure Walker, I am here to help you. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Walker sorry to intimate, no reservation is found on your name in our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you Walker for approaching us.