You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Justin Allen here.

ASSISTANT: Justin, how can I help you?

USER:  I have to go San Francisco for my film shooting purpose, can you please book a flight ticket from LAS to SFO?

ASSISTANT: Sure, can you please tell me your trip dates?

USER: My trip dates are from 09/13 to 09/15.

ASSISTANT: There is a flight available in Spirit airlines and the ticket costs you 100 only. Shall I book the ticket?

USER: Please book it to me.

ASSISTANT: Your ticket is booked successfully with the flight-1001.

USER: Thank you for your response.

ASSISTANT: Thank you for choosing us.