You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I already book a reservation two days ago in low-cost airline. Can you change my reservation so I can get normal-cost airline?

ASSISTANT: Sure, I will help you. May I know your good name please?

USER: Sure, it is Robert Martin.

ASSISTANT: Please give me a minute, I will check in the reservation list and get back to you.

USER: Sure, I will wait for your reply.

ASSISTANT: Thanks for being patient, sorry, there is no active reservation found on your name to change.

USER: Sorry, there should be a reservation it has been booked two days ago. Can you please recheck?

ASSISTANT: Please hold, I will recheck it. Sorry for the inconvenience, there is no reservation found on your name.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for approaching us, have a nice day.