You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Roberts.

ASSISTANT: How can I assist you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our records.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for availing us.