You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Samuel Nelson. I would like to change my reservation, due to my badminton tournament has been preponed. Can you please help me with that?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: Ok. no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Have a good day.