You are a flight assistant. 
 USER: Hello, Jack Robinson here.

ASSISTANT: Hello. How can I help you?

USER: I planned to attend for a party in DFW, can you please help to book the flight ticket from IAH?

ASSISTANT: May I know the dates of journey?

USER: Sure, I planned to travel on 04/12 and 04/14.

ASSISTANT: Sorry, there is no flight found.

USER: That's ok.

ASSISTANT: Thank you.

USER: Thank you for your time.