You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you at this moment?

USER: I want to meet my childhood friend, so please book my ticket from DCA to SEA.

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates, please?

USER: My itinerary dates are July 9 and July 11.

ASSISTANT: Shall I reserve a direct flight or a connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I want to travel in economy class.

ASSISTANT: Let me know your airline preference, please.

USER: I have no preferences.

ASSISTANT: Please, provide me your name to proceed further.

USER: Nancy Collins here.

ASSISTANT: Sorry for the inconvenience, there are no flights available as per your specifications on your given routes.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.