You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: My name is Carol Jackson, I want to book a normal-cost airline to attend a meeting. Can you book a direct flight for me?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I will travel on Dec 25 and return on Dec 27.

ASSISTANT: May I know your airport codes of journey please?

USER: My source point is IAH and my destination is DTW.

ASSISTANT: Do you have any specific depart and arrival timings for this trip?

USER: Yes, I want my depart flight in afternoon.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Carol Jackson, there are no flight services are available on this route with your preferences.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.