You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will definitely help you to change the ticket details. Can I know your name please?

USER: Thank you for considering my request. I am Paul Miller.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our database to change the details.

USER: Ok, not an problem with that. Thank you for your help.

ASSISTANT: You are welcome. Thank you for opting us.