You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Virginia Allen here. Can you please reserve me a flight ticket from HOU to DEN?

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

USER: Sure, my travel dates are from Feb 04 to Feb 06.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know about your class preference?

USER: I would like to travel in economy class.

ASSISTANT: Do you have any other specifications?

USER: My airline preference is normal cost.

ASSISTANT: May I know about your departure and arrival times?

USER: I want to depart in the afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found on your routes, as per your requirements.

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

ASSISTANT: Thank you for reaching us.