You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michelle Allen here.

ASSISTANT: How may I help you?

USER: I would like to attend a business meeting in Oakland, can you please reserve a flight ticket from DFW to OAK?

ASSISTANT: Ok, may I know your travelling dates to find a flight for you?

USER: Ok, I want to take off on June 19 and please book my return ticket also on June 21.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: We have a connecting flight-1005 in economy class, would you like me to proceed?

USER: That's perfect, you can proceed with booking now.

ASSISTANT: Ok, booking is done on Frontier airlines.

USER: Thank you for your kind help.

ASSISTANT: Thanks for contacting us, have a safe trip.