You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I would like to travel to Houston to visit famous places. Can you help me in booking a ticket?

ASSISTANT: May I know your airport codes please?

USER: The respective airport codes are IAH and HOU.

ASSISTANT: Can you please share your journey dates?

USER: I am planning my journey on dates 12/19 and 12/21.

ASSISTANT: May I know your name please?

USER: My name is David Martin.

ASSISTANT: David, I found a flight for you in Spirit airlines with price 100. Shall I proceed?

USER: Please proceed.

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

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.