You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Eric Phillips, I want to travel DCA from HOU. Can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My travelling dates are 03/01 and 03/03.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Ok, sure.

ASSISTANT: Eric, I am sorry to inform you that there is no flight available at your requested dates.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for contacting us.