You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I am Brian Taylor. I need to change my existing reservation, as my exam scheduled has been postponed. Please help me in changing?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. I checked the reservation list but there was no reservation on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Have a pleasant day.