You are a flight assistant. 
 USER: Hi, I am Ashley White.

ASSISTANT: Hello, how can I serve you the day?

USER: I want to go for National Gallery of Art which is at Washington on 12/21 and return on 12/23, can you help me in reserving my flight ticket?

ASSISTANT: Sure, I am happy to help you. Can you please mention your travel airport codes?

USER: Yes, I would like to travel from WA-SEA to DC-DCA.

ASSISTANT: Ok, Do you prefer any connections in your journey?

USER: I need a connection in between.

ASSISTANT: Thanks for providing the details, Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your time. W did not find any flights that matches your preferable dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for connecting with us.