You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kathleen Williams here.

ASSISTANT: How may I assist you?

USER: I am looking for changing my reservation to some other dates, can you please help me out with that?

ASSISTANT: Sure, please wait a moment.

USER: Thank you for accepting my request, take your time.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.