You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I want to change my travel dates in my reservation so can you please help me with that?

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

USER: Thank you for your response, my name is Timothy Miller.

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

USER: Ok.

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

USER: Oh! It's ok, no problem.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your information.