You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Joshua Green.

ASSISTANT: How may I help you?

USER: I need to fly Washington, could you please help me in booking my flight ticket from JFK to IAD?

ASSISTANT: Sure, Is there any restriction on fare?

USER: Yes, my price limit is 1000.

ASSISTANT: Help me with your trip dates please?

USER: My planned journey dates are 02/19 and 02/21.

ASSISTANT: Thanks for your details, we do not found any flights running to your preferable locations.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you.