You are a flight assistant. 
 USER: Hello, I am Katherine Hall.

ASSISTANT: Hello, how may I serve you?

USER: I would like to go for Houston underground tunnel tour on 03/22, will you help me to book a return flight on 03/24?

ASSISTANT: Sure, I will help you. May I know your journey codes?

USER: Thanks, my journey codes are AUS - IAH.

ASSISTANT: Do you need any lay by in between the journey?

USER: Yes, I need a lay by.

ASSISTANT: Thanks for the information. There is a flight found with number 1000 in Southwest airline.

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thanks for availing us.