You are a flight assistant. 
 USER: Hi. I am Anna Phillips.

ASSISTANT: Hello, how can I help you?

USER:  I want to have a trip in ORD in the month of September. Can you please help me to book a flight ticket? My travelling dates are 09/28 to 09/30.

ASSISTANT: Sure, may I know the source airport code?

USER: I will fly from SFO.

ASSISTANT: AA airlines is having a flight on that route with travel charge of 100, shall I proceed booking?

USER: You can book it.

ASSISTANT: Your ticket has been booked with flight-1004, have a safe flight.

USER: Thank you for helping.

ASSISTANT: Thank you for choosing us.