You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket with the name of Jason Collins to San Francisco, SFO?

ASSISTANT: Sure, I will help you. May I know your source code?

USER: I am planning to board from Seattle, SEA.

ASSISTANT: Kindly share your travelling dates.

USER: My depart will be on 09/15 and return will be on 09/17.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Delta airlines provide you a flight with number 1004 and the cost of the ticket is 100.

USER: You can proceed to book this flight.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thanks for availing us.