You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please reserve a flight ticket from DCA to IAD for my business meet?

ASSISTANT: Sure, may I know you trip dates?

USER: Thank you for considering my request, my departure is on Sept 12 and please book my return ticket also on Sept 14.

ASSISTANT: Can I know your name?

USER: Sure, my name is Steven Brown.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight for my journey.

ASSISTANT: Sorry, there are no flights available on your travel dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.