You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you aid me to book a flight ticket from LAS to PHX?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: My trip dates are Oct 18 and Oct 20 respectively.

ASSISTANT: May I know your good name?

USER: Matthew Walker here.

ASSISTANT: Ok, do you have any other requirements? Please wait for a minute.

USER: I prefer for connecting flight and my depart time should be in the afternoon. Ok.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.