You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Is this Central Travel agency? I want to book a ticket from Houston-HOU to attend workshop in Washington-DCA.

ASSISTANT: Yes, we are from Central Travel agency. May I know your name? Ok, can you share the trip flying and landing details?

USER: My departure date is 05/17 and return on 05/17. My name is Amanda Hall.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found as per your requested dates.

USER: That's ok, thanks for your information.

ASSISTANT: Welcome.