You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a ticket from HOU to IAD to attend my office meeting.

ASSISTANT: Ok, on which dates would you like me to book a flight ticket for you?

USER: My depart day on 19th Oct and return back on 21st Oct.

ASSISTANT: Do you prefer a stopover in between your journey?

USER: Yes, I need one stopover between my journey.

ASSISTANT: Please let me know if you have any other requirements.

USER: I don't want any other preferences, you can proceed and book my ticket.

ASSISTANT: May I know your name?

USER: Karen Harris here.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there were no flights found on you route.

USER: Not a problem, thanks for helping me.

ASSISTANT: Thank you for contacting us.