You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket for me form DCA to SEA?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates to book a flight?

USER: My trip dates are in Jan form 24th to 26th.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in evening. I want a connecting flight.

ASSISTANT: May I know your name?

USER:  I prefer business class. Ronald Mitchell here.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for approaching us.