You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to fly on Jan 26, return on Jan 28.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a single connecting flight.

ASSISTANT: Do you have any specifications on your journey?

USER: I want business class flight ticket.

ASSISTANT: May I know your name for the booking process?

USER: My name is Kevin Martinez.

ASSISTANT: Sorry, no flights are available on that route.

USER: Not an issue, thank you.

ASSISTANT: Welcome, thank you for reaching us.