You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. By what way can I help you out?

USER: I need to change my recent 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 Linda Wilson.

ASSISTANT: Ok,Please allow me a moment to check for the previous reservation in our database.

USER: Sure, I will be waiting.

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

USER: That's ok, thank you for searching my details.

ASSISTANT: Thanks for communicating with us.