You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Roberts.

ASSISTANT: How can I be of your service today?

USER: I need to book a flight ticket from HOU to PHX, Can you please help me for booking?

ASSISTANT: Sure, I can help you in that. Can you provide me your planned travel dates?

USER: I would like to travel on 07/19 to return on 07/21.

ASSISTANT: Ok, Is there any connection preference?

USER: Yes, I need a direct flight.

ASSISTANT: Sorry, there are no flights for your journey, on your travelling dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for approaching us.