You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me out in booking the direct flight from HOU to IAH.

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: My trip dates will be Dec 16 to Dec 18.

ASSISTANT: May I know your name?

USER: Carol Parker is my name.

ASSISTANT: Is there any other specifications regarding your journey?

USER: No.

ASSISTANT: Sorry, we did not find any flights for you.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.