You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I best serve you now?

USER: Can you help me in changing my recent reservation?

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

USER: I am Timothy Martinez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Its ok, thank you.

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