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 changed.

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

USER: Myself David Davis.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Ok, I will wait for your positive response.

ASSISTANT: Thanks for remaining so positive, we are sorry to say that there is no active reservation found on your name.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thanks for approaching us, wish you a great day.