You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kathleen Lopez.

ASSISTANT: How may I help you?

USER: I am planning a trip with my class mates to Detroit, can you please help me for booking?

ASSISTANT: Sure, please help me with your airport codes?

USER: I would like to travel on 07/29 and return on 07/31.

ASSISTANT: That's ok with the dates, can I know your airport codes?

USER: My airport codes are IAD and DTW.

ASSISTANT: We found a flight in Spirit airlines with price is 100 with number of connections 1, can I proceed booking your ticket?

USER: Proceed.

ASSISTANT: Your booking is done with flight number 1021.

USER: Thank you for helping me, great service.

ASSISTANT: Most welcome.