You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am looking for a flight from IAH to DCA, can you please help me in booking?

ASSISTANT: Sure, can you share your journey dates?

USER: My travelling dates are Dec 15 and Dec 17.

ASSISTANT: Do you have any specifications?

USER: I need a stopover in between my journey.

ASSISTANT: May I know your name?

USER: Sure, my name is Betty Taylor.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.