You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have planned to book a plane ticket from OAK to DTW, can you assist me?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferred dates are Feb 26th and Feb 28th.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Sandra Lopez.

ASSISTANT: Do you have any connection limit?

USER: I need single connection between my trip.

ASSISTANT: Do you have any other specifications? We found Southwest airline with price 300 and economy class and airline number is 1012 with arrival time is 21:00 hours and departure time is 11:00 hours, Shall I proceed for booking?

USER: I need to travel in normal-cost airline.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.