You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: Could you please help me to book a direct flight from PA to attend an interview in IL?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I need to depart on May 5th and my return date will be on May 7th.

ASSISTANT: Can you please provide me your exact airport codes?

USER: My source and destination airport codes are PHL and ORD.

ASSISTANT: Do you have any connection preferences?

USER: I need a direct flight.

ASSISTANT: Yes, there is a direct flight available with Southwest airline, shall I proceed?

USER: Yes, you can proceed with the booking.

ASSISTANT: Your booking is done with flight number 1015. Happy journey.

USER: Thank you for your assistance in booking.

ASSISTANT: May I know your name?

USER: I am Eric Parker.

ASSISTANT: Thank you for opting us.