You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Myself Margaret Jackson. I need to travel Houston to meet my friend, can you please reserve flight ticket from SEA and HOU?

ASSISTANT: Sure, please share me your trip dates.

USER: My ravelling dates are Dec,11 and Dec,13.

ASSISTANT: Is there any class preferences for you?

USER: I need economy class ticket.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a single connection for my journey.

ASSISTANT: Please share me other preferences you need.

USER: My depart time should be in the evening.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: That's ok, thank you for searching the available flights.

ASSISTANT: Thank you for opting us.