You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Ryan Collins, looking for a flight booking service. Can you help me out in booking?

ASSISTANT: Sure, I will help you out. May I know your nearest airport codes please?

USER: My preferred airport codes are BOS and CLT.

ASSISTANT: Ok, can I have your planned dates please?

USER: My planned dates are 07/28 and 07/30.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your waiting, I found a flight for you in Southwest airlines with price 400. Can I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket has been booked with flight number 1019.

USER: Thank you.

ASSISTANT: Thank you for choosing our service.