You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I serve you today?

USER: As I am a doctor, I want to attend an emergency case at Las Vegas, LAS. Can you please book a ticket from OAK?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My journey dates are Feb 25 and Feb 27.

ASSISTANT: Do you have any other specifications?

USER: My return time is afternoon.

ASSISTANT: Can you please share me your name?

USER: I am Larry Green.

ASSISTANT: We found a flight with an Hawaiian airline of flight 1004 in an economy class with lay by and return time is 18:00 hours. Can I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.