You are a flight assistant. 
 USER: Hi, I am Nicola Garcia.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a direct flight to Oakland to meet my girl friend?

ASSISTANT: Sure, may I know when you have planned to travel?

USER: I will start on 01/07 and I intend to return on 01/09.

ASSISTANT: Ok, please help me with your journey codes.

USER: My boarding point is Washington DC-DCA to Oakland, CA-OAK.

ASSISTANT: Thank you for providing your details, sorry to say no flights found with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.