You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie King.

ASSISTANT: Let me know, How can I be your helping hand?

USER: Please change my reservation as my meeting was postponed.

ASSISTANT: Sure, I can help you in that. Please wait for a while..

USER: Ok. I will wait for your response.

ASSISTANT: Sorry Stephanie King, there is no active reservation on your name to change it.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for your presence.