You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit my ailing grandfather, could you book a ticket for me?

ASSISTANT: Sure, I can help you with that. May I know your name to proceed further?

USER: My name is Brian Miller.

ASSISTANT: Can you please provide your source and the destination airport codes?

USER: My airport codes are DFW and OAK.

ASSISTANT: Brian, can you please help me with your travelling dates?

USER: My journey dates are 05/19 and 05/21.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: Brian, there is a flight available at your requested dates with price 100. Would you like me to proceed the booking?

USER: Proceed with my booking.

ASSISTANT: Sure. Your booking is confirmed.Your flight number is 1010 and the airline is Southwest. Have a great journey.

USER: Thank you for assisting me?

ASSISTANT: You are welcome. Thank you for contacting us.