You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Please assist me to change my active reservation as my meeting was postponed.

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Myself Thomas Harris.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us, Wish you a great day.