You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please book a ticket from SEA to HOU to meet my family friend.

ASSISTANT: Sure, may I know your travel dates to proceed further?

USER: My travelling dates are Mar 23 and Mar 25.

ASSISTANT: Do you have any specific class preference?

USER: Yes, I prefer economy class.

ASSISTANT: May I know your connection limit please?

USER: I want a direct flight.

ASSISTANT: Do you have any other preference?

USER: I prefer normal-cost airline.

ASSISTANT: Sure, May I know your name please ?

USER: Sure, I am Jonathan Hernandez.

ASSISTANT: Sorry, we don't have any direct flight available between given route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us, we looking forward to serve you batter next time.