You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: Richard Roberts here, due to sudden changes my exams has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am willing to help you. Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, sorry to say no reservation found with your name.

USER: Not an issue, thank you for your help.

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