You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Betty Hernandez. I need to change my recent reservation due to postpone of my exam. Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you. Ok, wait for a  while.

USER: Thank you. Sure.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No worries, thank you for your information.

ASSISTANT: Thanks for approaching us.