You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am looking for a flight from HOU to DTW, can you help me in booking?

ASSISTANT: Sure, let me know your connection limit?

USER: Please look for a connecting flight.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer for an economy class.

ASSISTANT: Any other requirement to be met?

USER: I would like to return my journey for the evening flight.

ASSISTANT: Ok, when are you planning your trip?

USER: My planned travel dates are Feb 05 and Feb 07.

ASSISTANT: Can you share your name to proceed further?

USER: Myself Elizabeth Mitchell.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.