You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Gary Edwards. Can you please book me a flight ticket to visit IAD from CLT?

ASSISTANT: Sure, may I know your travel dates please?

USER: Sure, my travel dates are Dec 5th and Dec 7th.

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

USER: Yes, I need a single halt in between my journey.

ASSISTANT: Do you have any specific airline preference?

USER: My airline preference is of normal-cost.

ASSISTANT: How much can you afford for your reservation?

USER: I can afford only 200.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your requested travelling details.

USER: Ok, not an issue. Anyways, thank you for the service.

ASSISTANT: Thank you for consulting us.