You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to travel from LAS to PHX. Can you help me to book a flight ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: I want to fly in the flight on Aug 10 and Aug 12.

ASSISTANT: Do you have any specifications?

USER: I am looking for a direct flight.

ASSISTANT: May I know your name?

USER: Timothy Roberts.

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

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us.