You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am David Brown. I am planning to visit Angel Island at Oakland, could you please help me with booking a flight ticket?

ASSISTANT: Yes, I can help you. Could you share me your dates of travelling?

USER: I would like to take off on 01/26 and return on 01/28.

ASSISTANT: Ok, can you tell me your nearest airport codes?

USER: My nearest source airport code is ORD and destination airport code is OAK.

ASSISTANT: Give me a moment, I will get back to you.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip. Thank you for the information.

ASSISTANT: Thank you for consulting us.