You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for the day?

USER: Can you please book a flight ticket from SFO to LAX?

ASSISTANT: Sure, when are you planning to travel?

USER: Thank you. I have planned my travel dates as Mar 20 and Mar 22.

ASSISTANT: May I know your name please?

USER: Sure, myself Ashley Green.

ASSISTANT: Do you have any requirements?

USER: I would like to depart in evening time so please check with that.

ASSISTANT: We found a flight in an airline United with 1021 number having it's depart time in the evening at 22:00 hours. Shall I proceed to book?

USER: That is fine, please proceed with booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.