You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am willing to book a flight from EWR to reach Washington, so please help me in booking.

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: My travelling dates are on July 1st to 3rd.

ASSISTANT: May I know your destination airport codes?

USER: My destination airport code is IAD.

ASSISTANT: May I know your name?

USER: Sure, my name is Rebecca Hernandez.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.