You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to meet my twin sister, please book my ticket from DFW to SEA.

ASSISTANT: Sure, I will help you in booking. Can I have your travel dates please?

USER: My trip date are 04/21 and 04/23.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Here, I found a direct flight for you. Shall I proceed?

USER: Please search for a connecting flight.

ASSISTANT: Ok. May I know your name?

USER: Debra Brown here.

ASSISTANT: Sorry, no connecting flights are available on your route.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for choosing us.