You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I amend you?

USER: I am Larry Collins. I need to go to Oakland to visit Mountain view cemetery with my college friends on 10/09? Will you please help me in booking a flight ticket?

ASSISTANT: Sure. When are you planning to return your journey?

USER: I would like to return on 10/11?

ASSISTANT: Help me with your airport codes please.

USER: I am heading to Oakland, OAK from Denver, DEN.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Thank you for being patience, there is a flight available with Delta airline, flight number 1020 with fare 200 and a lay by. Shall I proceed to book?

USER: Yes, proceed.

ASSISTANT: Your booking has been done.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.