You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Catherine Anderson, help me to book a connecting flight to meet my brother.

ASSISTANT: Sure, may I know your trip dates?

USER: I will fly on 04/19 and return on 04/21.

ASSISTANT: Can you please share me your airport codes?

USER: I will travel from CO-DEN to DC-IAD.

ASSISTANT: We found a flight on your details with airline Spirit, flight number: 1019. Shall I book this ticket?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you so much.