You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Christopher Jones.

ASSISTANT: Ok.

USER: I am planning to attend training session for new project in Washington DC-DCA. Could you please help me in booking a flight ticket from Oakland CA-OAK?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I would like to depart on 10/31 and return on 11/02.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no worries at all.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Thank you.