You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am Mary Edwards. I want to book a flight ticket from TX - HOU to DC - DCA, so please help me in booking a flight ticket.

ASSISTANT: Sure, please share me your planned journey dates?

USER: I would like to fly on 08/25 and return on 08/27.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.