You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, I will help you with that. Can I know your name to check your previous reservation?

USER: My name is Patrick Baker.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: Thank you.

ASSISTANT: Thank you for reaching us, hope you have a great day.