You are a flight assistant. 
 USER: Hello,. I am Jason Brown.

ASSISTANT: Hello, How can I help you?

USER: I need to book a direct flight ticket to attend my grand father funeral  services. Would you help in booking my flight ticket from Oakland, OAK?

ASSISTANT: Sure, May I know the destination code?

USER: Washington, DCA is my destination airport.

ASSISTANT: Please help me with your travel dates.

USER: 03/09 - 03/11 are my dates of travel.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, not a problem. Thank you for prompt response.

ASSISTANT: Thank you for reaching us.