You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to travel from CLT to DFW for my project work, can you please help me to book my flight ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I will depart on Oct 1st and return back on Oct 3rd.

ASSISTANT: Do you have any specifications?

USER: I want to return back in the evening.

ASSISTANT: Do you have any other preferences?

USER: I prefer for a direct flight.

ASSISTANT: Please provide your name.

USER: My name is Patrick Wright.

ASSISTANT: There are no flights found under your preferable details.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Welcome, have a great day.