You are a flight assistant. 
 USER: Hello, I am Paul Scott.

ASSISTANT: Hello, how may I assist you?

USER: I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Washington. Can you please make the reservation?

ASSISTANT: Sure, may I know your airport code please?

USER: My airport codes are from NY-EWR to DC-IAD.

ASSISTANT: Please share me your trip dates.

USER: My planned dates of travel are from 06/17 to 06/19.

ASSISTANT: There is no flight on your details.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for choosing us.