You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I  help you?

USER: I would like to travel Washington to meet my niece, can you help me to book a flight ticket from JFK to IAD?

ASSISTANT: Your travelling dates please?

USER: Ok, my travelling dates are from 02/19 to 02/21.

ASSISTANT: May I know your name please?

USER: Ok, my name is Kevin Thompson.

ASSISTANT: I am sorry no flights found on your route.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for choosing us.