You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please assist me in booking a flight ticket from EWR to IAH.

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from Dec 9th to Dec 11th.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want a single connection in between my journey.

ASSISTANT: Can I know your name please?

USER: I am Ruth Roberts.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you.

ASSISTANT: Most welcome.