You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Karen Anderson. Can you please help me in booking a flight ticket from IAD to SEA?

ASSISTANT: Sure, please help me with your scheduled dates.

USER: I want to fly on Apr 10 and return on Apr 12.

ASSISTANT: Ok, May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, There were no flights found with your given requirements.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.