You are a flight assistant. 
 USER: Hi, I am Alexander Lopez.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I want to book a flight ticket to Houston to visit flower festival, can you help me to book a direct flight?

ASSISTANT: Sure, may I know your journey dates?

USER: I will start on 02/25 and I intend to return on 02/27.

ASSISTANT: Can you please share your journey points?

USER: My plan to start from Washington DC-DCA to Houston, TX-IAH.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. You have no flights to travel on your particular days of journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a good day.