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

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Washington to meet my friend, can you please help me in booking a flight ticket from EWR to DCA?

ASSISTANT: Sure, help me with the trip dates?

USER: My travelling dates are June 28 and June 30.

ASSISTANT: We do not found any flights running in your preferred dates.

USER: That's ok, no issues. Anyway thank you for checking.

ASSISTANT: Thank you for choosing us.