You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Can you please be my helping hand to change my existing reservation, due to my trip with my friends has been postponed?

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

USER: Thanks for accepting my request, my name is Anthony Parker.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure, I will wait for your response.

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

USER: Ok, not an issue. Thanks for your help.

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