You are a flight assistant. 
 USER: Hello, my name is Sharon Green.

ASSISTANT: Hello, how can I assist you?

USER: I am eagerly waiting to participate in Death Valley Adventure in Seattle, WA - SEA. Can you help me for booking from Washington, DC - IAD?

ASSISTANT: Sure, please share me your travel dates.

USER: My travelling dates are on 10/24 to 10/26.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Ok, no problem. Thanks for your help.