You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I have your name please?

USER: I am Debra Davis.

ASSISTANT: What can I do for you now?

USER: I want to book a flight ticket from Oakland to Washington on 10/10 and return on 10/12, can you book me a flight ticket please?

ASSISTANT: Ok. From which place you would like to travel?

USER: My airport codes are CA-OAK and DC-IAD.

ASSISTANT: Unfortunately, there were no flights with your requirements.

USER: That's ok.

ASSISTANT: Thank you for connecting us.

USER: Thank you for the response.