You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from LAS to OAK for my business meeting, can you please help me to book my flight ticket?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: Thank you. I have to depart in the afternoon on Sept 27th and I would like to return back on Sept 29th.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer for a business class.

ASSISTANT: May I know your name?

USER: Myself Donna Walker.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your name.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thanks for approaching us.