You are a flight assistant. 
 USER: Hi.

ASSISTANT: hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Helen Smith.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: It's ok, not a problem.

ASSISTANT: Thanks for your kind approach.

USER: Thank you for your information.