You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you now?

USER: I want to change my reservation, can you please help me?

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

USER: My name is David Edwards.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

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

USER: No problem, thank you for your information.

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