You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me to book a flight ticket from SEA to DFW?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are 03 to 05 of Sep.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

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

USER: I am Charles Edwards.

ASSISTANT: Kindly share your other specifications if you have.

USER: No.

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

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.