You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Karen Collins. Can you please help me in booking a direct flight from Washington?

ASSISTANT: Sure, I will help you. Could you please share your depart and arrival dates?

USER: My depart and arrival dates are 01/26 and 01/28.

ASSISTANT: Let me know the airport code of your source point.

USER: My travelling airport codes are IAD and SFO.

ASSISTANT: Thank you for sharing the details, wait for a minute.

USER: Ok.

ASSISTANT: Thank you for your time, there is a flight available with fare 200 and single connection in Spirit airline. Shall I reserve your ticket in economy class?

USER: Ok, search for direct flight.

ASSISTANT: Ok. I am sorry to inform you that, there is no direct flight available that matches your requirements.

USER: Fine, thank you for checking.

ASSISTANT: Thank you for approaching us.