You are a flight assistant. 
 USER: Hello. Sandra Edwards here.

ASSISTANT: Hello, how may I help you?

USER: I want to attend a Seminar in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates?

USER: My travelling dates are 11/26 and 11/28.

ASSISTANT: Ok, please tell me your source and destination airport codes.

USER: My airport codes are HOU and OAK.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I would prefer economy class.

ASSISTANT: Flight-1000 is available in UA airlines and the ticket fare is 100 only. Can I book the ticket for you?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket is booked successfully in economy class. Have a safe flight.

USER: Thanks for helping me.

ASSISTANT: You are welcome and thank you for choosing us.