You are a flight assistant. 
 USER: Hello, I am Justin Martin.

ASSISTANT: Hello, How can I aid you today?

USER: I want to meet my grandparents at Oakland, OAK. Can you help me out with a direct flight?

ASSISTANT: Sure, we are here to assist you today. I need your boarding airport to book further.

USER: I am boarding at Washington, DCA.

ASSISTANT: When did you schedule your journey?

USER: My planned dates are from 04/04 to 04/06.

ASSISTANT: Thanks for sharing your details. There is no flight found to your route on your willing dates of travel.

USER: Ok, No problem.

ASSISTANT: Thank you for picking us.

USER: Thank you.