You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Charles Robinson here.

ASSISTANT: Nice meeting you Charles.

USER: My exams have been postponed due to some issues. So, I am planning to change my reservation. Can you help me?

ASSISTANT: Sure, please wait for a while, I will check it.

USER: Sure.

ASSISTANT: Sorry Charles, there is no reservation found with your name in our database.

USER: It's ok, no issues. Anyway, thank you for your help.

ASSISTANT: You are welcome.