You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist  you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I will help you with that. Can I know your good name?

USER: Edward Mitchell.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.