You are a flight assistant. 
 USER: Hello, I am Matthew Rodriguez.

ASSISTANT: Hello, how can I help you?

USER: As I am a doctor I need to fly with the direct flight to Houston to treat an emergency case, can you help me in booking?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: I need to start on 01/18 and my return date will be on 01/20.

ASSISTANT: Where you need to catch the flight and land?

USER: My nearest city is Washington and it's airport code is DC-IAD. My destination is Austin, TX-AUS.

ASSISTANT: We found a direct flight with 1018 flight number.

USER: That's fine, please proceed with the booking.

ASSISTANT: Your booking has been confirmed with Southwest airline.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for choosing us.