You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Lisa Hernandez, I would like to travel PHX for visiting my sister's birthday party. Please, assist me to book a flight ticket from DCA.

ASSISTANT: That's nice, I can help you in booking flight ticket. Could you please let me know your travel dates for booking flight ticket?

USER: Ok. My travelling dates are 09/19 and 09/21.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Ok, sure.

ASSISTANT: I have found a flight in this route, airline is Delta and flight number is 1021. Shall I proceed?

USER: Yes, proceed with my booking.

ASSISTANT: Your flight ticket is booked successfully.

USER: Thank you for booking.

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