You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me to book a flight from DFW to ORD?

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

USER: My travelling dates are Nov 20 and 22.

ASSISTANT: Do you have any specifications about flight connections?

USER: I prefer connecting flight.

ASSISTANT: Do you have any specifications about class?

USER: No.

ASSISTANT: Please mention your name.

USER: My name is Jerry Harris.

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

USER: No issues, thank you for your information.

ASSISTANT: Welcome, have a great day.