You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Brian Harris. Can you please help me in booking my flight ticket from EWR to HOU?

ASSISTANT: Sure, I am glad to help you out. Please provide me your trip dates to book the flight ticket.

USER: My trip dates are 08/18 and 08/20.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Brian Harris, there is no flight in your route with your travel dates. I regret for this issue.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.