You are a flight assistant. 
 USER: Hello. I am Cynthia Jones.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to celebrate the traditional festival with my family members in Washington DC-IAD, so please help me in booking a flight ticket from New York NY-LGA.

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to depart on 12/31 and return on 01/02.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.