You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Oakland, OAK?

ASSISTANT: Sure, may I know your travel dates?

USER: My journey dates are from Feb 23 to Feb 25.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: In which airline do you want to travel?

USER: I prefer to travel in normal cost airlines.

ASSISTANT: Do you have any other specifications?

USER: My departure time is afternoon.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Emily Jackson.

ASSISTANT: Sorry, there were no flights found on your specified details.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.