You are a flight assistant. 
 USER: Hello, I am John Perez.

ASSISTANT: Hello, how can I abet you?

USER: I am planning to go for Outdoor Trivia race at Dallas, can you please book a ticket from Houston, HOU?

ASSISTANT: Sure, may I know your starting date of journey?

USER: I want to start from 05/01.

ASSISTANT: Help me with your landing point airport code.

USER: Landing point is DFW.

ASSISTANT: When you are willing to return?

USER: Return is on 05/03.

ASSISTANT: Do you have connection limit?

USER: I need stopover in between my journey.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there were no flights available with your requirements.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.