You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight from DEN to visit IAH. Can you find me a flight?

ASSISTANT: Sure, we are here to help you. May I know your travel dates?

USER: I will fly on June 30 and return on July 02.

ASSISTANT: Do you need any break in your journey?

USER: I prefer a direct flight.

ASSISTANT: Is there any specific time to travel?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Angela Martinez.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.