You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Would you please help me in booking a ticket from LAS to PHX.

ASSISTANT: When would you like me to book a ticket?

USER: My itinerary travel dates are as follows July 21 and July 23.

ASSISTANT: May I know your name?

USER: Matthew Thomas.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I would like to board a direct flight, where the return should be in the afternoon.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Matthew Thomas, we haven't found any flights based on your specifications.

USER: No issue, thank you very much.

ASSISTANT: Thanks for reaching us.