You are a flight assistant. 
 USER: Hi, I am Lisa Nelson.

ASSISTANT: Hello. How can I serve you?

USER: I would like to fly to Detroit on Apr 19th to visit Ambassador Bridge and my return date will be on Apr 21st, can you please help me in booking?

ASSISTANT: Sure, I can help you. In which class do you want to travel?

USER: I am comfortable with any class.

ASSISTANT: How much can you pay for buying your ticket?

USER: 500 is my fare limit.

ASSISTANT: May I know your source and destination airport codes?

USER: My boarding point is SEA and my landing point is DTW.

ASSISTANT:  Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: We found a Spirit airline, flight number:1001 and the price is 100.

USER: That's perfect, you can book the ticket with this airline.

ASSISTANT: Your flight ticket has been processed.

USER: Thank you for your support in booking.

ASSISTANT: Thank you for choosing us.