You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Myself Alexander Collins here. I want to visit National Mall which is located at Washington, can you please help me to book a ticket?

ASSISTANT: Can you share your airport codes please.

USER: Sure, my airports codes are HOU and DCA.

ASSISTANT: Let me know your dates too.

USER: Yes, my travelling dates for shopping purpose is from 05/20 to 05/22.

ASSISTANT: Ok, we have a flight for you with connection 1 on airline Southwest. Shall I proceed?

USER: Perfect, please book it for me.

ASSISTANT: Ok, your ticket has been done with flight number 1012.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.