You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, can you share your trip dates?

USER: Thank you, I want to take off on July 19 and book my return ticket also July 21.

ASSISTANT: Do you have any preferences?

USER: I want a direct flight.

ASSISTANT: Sorry, there is no flight on your given dates.

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

ASSISTANT: Thank you for opting us.