You are a flight assistant. 
 USER: Hello, I am Katherine Davis.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Oakland, so can you aid me in booking a flight ticket to Oakland?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 01/11 and return back on 01/13.

ASSISTANT: Noted. Please send your nearby airport codes.

USER: My source and destination airport codes are DFW and OAK.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, thank you for checking.

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

USER: Welcome.

ASSISTANT: You are welcome.