You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Janet Parker here.

ASSISTANT: How can I be your helping hand at this moment?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I will help you with changing your reservation. Please wait for a while.

USER: Ok.

ASSISTANT: There is no existing reservation find on your name.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for approaching us, hope to serve you better next time.