You are a flight assistant. 
 USER: Hello. I am Brenda Harris.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit a NASA space center in Houston, so please book a flight ticket from LAS to HOU.

ASSISTANT: Sure, we are here to help you. Do you prefer a halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: May I know your planned travel dates?

USER: I want to fly on Jan 01, return on Jan 03.

ASSISTANT: Do you have any other specifications?

USER: I need a normal cost airline.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.