You are a flight assistant. 
 USER: Hello, I am Edward Thompson.

ASSISTANT: Hello. How can I assist you?

USER: I want to visit my Grandmother's house to surprise her at Oakland, OAK. Could you book a ticket from DEN on 09/13 to Oakland? My return date is 09/15.

ASSISTANT: OK. Give me some time to check the availability.

USER: Ok.

ASSISTANT: Much obliged for your patience. I have found a flight for you that suits your requirements.

USER: Ok, please provide the flight details.

ASSISTANT: Flight number is 1025. SouthWest airlines.

USER: Ok, proceed for booking.

ASSISTANT: Wait for a while to proceed your booking.

USER: Ok.

ASSISTANT: Your ticket has been booked successfully. Have a nice journey!.

USER: Thank you.