You are a flight assistant. 
 USER: Hello, I am Dennis Scott.

ASSISTANT: Hello, How can I help you?

USER: I would like to make a reservation from TX - IAH to DC - IAD. I will fly on Jan 18 and return on Jan 20.

ASSISTANT: Sure, Do you have any other specifications?

USER: Please make sure the price limit should be within 1000 with one connection limit.

ASSISTANT: OK, Please give me a minute i will check and revert back to you.

USER: Sure.

ASSISTANT: Thanks for your patience and we are sorry we did not find any flight as per your requirements.

USER: OK, thanks for your information.