You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am here to help you with that. Can you please tell me your name to check the ticket status?

USER: Ok. My name is Mark Edwards.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, I have not found any reservation on your name in our database to modify the details.

USER: Thank you.

ASSISTANT: You are most welcome. Thank you for approaching us.