You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: I am planning to meet my nephew, after a long time in Washington, DC - DCA, will you help me in flight booking?

ASSISTANT: Sure, May I know the travelling dates and origin?

USER: My origin from WA - SEA, and my travelling dates from 02/08 to 02/10.

ASSISTANT: Ok, Please wait a while, I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Let me know your name?

USER: My name is Matthew Carter.

ASSISTANT: Ok, Unfortunately, there are no flights available with your request.

USER: Ok, not an issue. Thank you, for your service.

ASSISTANT: Thank you.