You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Lee.

ASSISTANT: How may I assist you today?

USER: I need to attend the conference about the New App which is done my an student at Seattle. Could you please help me in booking a ticket with fare of 200?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are 04/21 and return on 04/23.

ASSISTANT: Help me with the airport codes?

USER: My airport codes are ORD and SEA.

ASSISTANT: We found a flight in an airline Spirit of number 1021 with a price of 100 having a single connection. Shall I reserve?

USER: You can reserve a ticket.

ASSISTANT: Your flight ticket is done with the booking.

USER: Thank you.

ASSISTANT: Thank you for your approach. Have a safe journey.