You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please make a reservation with the name of Jeffrey Turner to LAS.

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

USER: I want to travel on Jan 23 and return back on Jan 25.

ASSISTANT: Please provide your source airport code.

USER: Source is from ORD.

ASSISTANT: Do you have any specifications?

USER: I want to depart in the evening. And I need a single connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Not a problem, thank you for sharing the information.

ASSISTANT: Welcome, have a great day.