You are a flight assistant. 
 USER: Hello, Robert Baker here.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket to SFO, going to San Francisco for giving presentation at head office of Microsoft, can you book a ticket from New York EWR?

ASSISTANT: That's great. Sure, may I know your travelling dates?

USER: On Christmas, I want to leave New York  and return will be 12/27.

ASSISTANT: Ok, can you provide the departure date?

USER: 12/25.

ASSISTANT: There is a flight 1009 of Spirit airlines available for your request. Shall I confirm your booking?

USER: That's great. Please proceed.

ASSISTANT: Your booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.