You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I'm Charles Roberts here. I want to visit Phoenix, can you please help me to book a ticket from IAH to PHX?

ASSISTANT: Sure, can you please provide me your trip dates?

USER: Ok, my planning is from 08/05 to 08/07 to reach my destination.

ASSISTANT: Thank you, please be on hold for a moment.

USER: Sure, but I want a flight which is direct for me.

ASSISTANT: Sorry Charles, there are no direct flight available to PHX on your preferred dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: You are welcome.