You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from SEA to DFW. Please help with that.

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates will be May 2nd to May 4th.

ASSISTANT: Is there any class preferences for you?

USER: I am fine with any class.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: May I know your airline preferences?

USER: I need a airline with normal cost.

ASSISTANT: For booking, we need your good name, Please provide it.

USER: I am Michael Hall.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.