You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you aid me to book a flight ticket from IAH to IAD?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: I planned my trip  on the dates Dec 5 and Dec 7.

ASSISTANT: Do you need any layover in between  journey?

USER: I am happy with any connecting flight.

ASSISTANT: If you have any other preference regarding your journey?

USER: No, other preferences. Thank you for asking.

ASSISTANT: May I know your name please?

USER: Myself Margaret Harris.

ASSISTANT: Thanks for sharing your details, we are unable to provide flight in between your journey routes.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you very much for approaching our agency.