You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to fly from PHX ato IAH. Can you book a flight with single connection for that route?

ASSISTANT: Sure, I will help you with that. May I know your travelling dates?

USER: My planned travelling dates are 08/19 and 08/21.

ASSISTANT: Do you have any other specifications regarding your journey?

USER: No more, thank you.

ASSISTANT: May I know your name please?

USER: Sure, Alexander Nelson here.

ASSISTANT: Sorry to say that, there are no flights available on this route as per your travel dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.