You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Michael Collins, is my name.

ASSISTANT: Please wait for a while.

USER: Sure, make it as soon as possible.

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

USER: That's ok, not an issue. Thanks for your effort.

ASSISTANT: Thank you for choosing us, hope to serve you again.