You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Janet Wright.

ASSISTANT: How can I assist you?

USER: I want to change existing flight reservation. Could you please help me?

ASSISTANT: Sure Janet, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: That's ok no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for helping me.