You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Me and my parents are going to attend my grandfather's memorial service. So, help in making a reservation with direct flight.

ASSISTANT: Sure. May I know your good name?

USER: Sandra Hall is here.

ASSISTANT: Let me know your trip dates.

USER: 08/04 - 08/06 are my dates of journey.

ASSISTANT: Can I know your airport codes?

USER: My boarding point is at DCA, and destination is at IAD.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no direct flight available with your given specified dates.

USER: No problem, I will go with another flight. Thank you for aiding me.

ASSISTANT: Thank you.