You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a direct flight to reach Houston?

ASSISTANT: May I know your travelling airport codes?

USER: My airport codes are DFW - IAH.

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My planned dates are on Apr 21st to 23rd.

ASSISTANT: Can I know your name?

USER: Sure, my name is Barbara Carter.

ASSISTANT: There is a direct flight 1016 of Frontier airlines, can I proceed?

USER: That's great, you can proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you.

ASSISTANT: You are welcome.