You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Hernandez here.

ASSISTANT: Debra, how can I assist you?

USER: I want to meet my sister-in-law at Oakland, could you book my ticket from Denver?

ASSISTANT: Sure, can you please tell me your preferred airport codes?

USER: I will depart from DEN and land at OAK.

ASSISTANT: Ok, may I know your travel dates?

USER: I will travel on 02/28 and return on 03/01.

ASSISTANT: There is a flight available with Frontier airlines and the ticket fare is 100 only. Is that ok for you?

USER: Please book my ticket.

ASSISTANT: Your ticket is booked with the flight-1001.

USER: Thank you for assisting me.

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