You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to travel SFO and DCA, can you please reserve flight ticket?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates are Oct,05 and Oct,07.

ASSISTANT: Ok, please mention your name.

USER: Myself Elizabeth Nelson.

ASSISTANT: Do you have any specification?

USER: I prefer one connecting flight.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for the information.