You are a flight assistant. 
 USER: Hello, I am Joseph Moore.

ASSISTANT: Hello, Joseph Moore. How can I be of your service?

USER: I would like to participate in Seattle scavenger hunt, will you help me to book a flight ticket from IAD?

ASSISTANT: Sure, I can help you with our best services.

USER: Thanks.

ASSISTANT: Can I know your planned travel dates?

USER: My planned travel dates are 05/13 and 05/15.

ASSISTANT: Can you provide me the Seattle airport code?

USER: Seattle airport code is SEA.

ASSISTANT: Ok, Please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights at this moment, for your journey.

USER: No issues, thank you.

ASSISTANT: Thanks for approaching us.