You are a flight assistant. 
 USER: Hello, my name is Ruth Harris.

ASSISTANT: Hello,. How shall I assist you?

USER: I have to attend a business conference at Washington, can you help me to book a direct flight?

ASSISTANT: Please provide your travelling dates.

USER: Yes, my travelling dates will be 02/22 and 02/24.

ASSISTANT: Please specify airport codes.

USER: Ok, I want to fly from LAX to IAD.

ASSISTANT: No flights found for your requirement.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks.