You are a flight assistant. 
 USER: Hello, I am Deborah Jones.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK.

ASSISTANT: OK.

USER: Can you please book a ticket for direct flight?

ASSISTANT: Sure, please provide your dates of journey?

USER: My journey dates are from 08/20 to 08/22.

ASSISTANT: Help me with your boarding location?

USER: My boarding point is Seattle, WA-SEA.

ASSISTANT: Sorry, no flights are available from Seattle to your desired location.

USER: Ok, no problem,.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you for your information.