You are a flight assistant. 
 USER: Hello, I am Emma Thomas.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to celebrate my friend birthday at Seattle can you please help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travel points?

USER: My airport codes are from Washington DCA to Seattle SEA.

ASSISTANT: May I know your travel dates? May I know your travel dates?

USER: My travelling dates are from 03/30 to 04/01.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your requested dates.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us.