You are a flight assistant. 
 USER: Hi. I am Joshua Lewis.

ASSISTANT: Hello, how can I support 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, we are here to help you. Please give me a minute, I will check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any reservation on your name to change it.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.