You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please book me a ticket from DFW to DTW?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My preferable journey dates are July 31 and Aug 02.

ASSISTANT: Do you need any specifications?

USER: I prefer normal cost airline.

ASSISTANT: Can I know your name please?

USER: My name is Donald Jackson.

ASSISTANT: Do you have any other preferences?

USER: I prefer connecting flight.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.