You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Samuel Jones from Las Vegas. Can you please help me in flight ticket booking process from LAS to LAX?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for your positive response.

ASSISTANT: May I know when are you planning your trip?

USER: I want to take off on 08/15 and please confirm my return ticket also on 08/17.

ASSISTANT: Sure, do you have any preferences for your journey?

USER: No.

ASSISTANT: I am sorry to inform you that there is no flight available on given criteria by you.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, hope to serve you better next time.