You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My IELTS exam got postponed. So, please help me in changing my existing reservation.

ASSISTANT: Sure, we will help you with this. May I know your name please to check the status?

USER: My name is Raymond Gonzalez.

ASSISTANT: Raymond, there is no reservation found with your details in our database.

USER: Ok, I think my brother has changed my reservation.

ASSISTANT: Thank you for contacting us, have a good day.

USER: You are welcome.