You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Timothy King here, I would like to celebrate flowers festival with my friends. Can you please help me to book a ticket from 10/13 to 10/15.

ASSISTANT: Sure, please help me with your travel airport codes?

USER: From IAD to OAK.

ASSISTANT: Ok, any other requirements?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your given details.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for choosing us.