You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Davis.

ASSISTANT: How may I help you out?

USER: Can you please help me to book the flight from LAS to OAK?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, I want to travel on Feb 15 and need to return on Feb 17.

ASSISTANT: Do you need any specifications?

USER: Yes, I need a connecting flight which returns in the afternoon time.

ASSISTANT: Can I know your preferences?

USER: I do not have any other preferences.

ASSISTANT: There is a flight with connection 1 and price 200 with flight number 1020, can I proceed?

USER: Ok, please proceed.

ASSISTANT: Ok, your ticket has been booked with flight number 1020.

USER: Thank you.

ASSISTANT: Thank you for reaching us.