You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Will you book a ticket to Austin, AUS?

ASSISTANT: Sure, may I know your source point?

USER: I need to attend the birthday of my elder sister, so I will start from San Francisco, SFO.

ASSISTANT: Please provide me your planned travel dates.

USER: 04/28 -04/30 are the travel dates.

ASSISTANT: Your good name please.

USER: I am Daniel Mitchell.

ASSISTANT: We are glad to say that, we found an airline: Delta, flight number: 1004 and price is 300.

USER: Ok. You can confirm.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.