You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need a direct flight for my journey to Washington in the month of March for a client meet with my client. So, I need your help in booking my flight ticket from SFO to IAD.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my departure and arrival dates are 03/21 and 03/23.

ASSISTANT: Ok, could I have  your name please?

USER: Sure, I am Jacob Perez.

ASSISTANT: Sorry, all flight tickets are sold out on your requested travelling dates.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: You are welcome.