You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Alexander Hernandez. I need to give a seminar in my college. Can you book me a ticket from HOU to OAK?

ASSISTANT: Sure, please share me your trip dates.

USER: I would start on June 29th and return on July 1st.

ASSISTANT: Do you need any specifications?

USER: Yes, I need a halt within my route.

ASSISTANT: Please hold for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.