You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking my flight ticket from DFW to ORD?

ASSISTANT: Let me know the travel dates.

USER: My travelling dates are Mar 05 and Mar 07.

ASSISTANT: Is there any connection limit.

USER: I want direct flight.

ASSISTANT: Is there any class preference?

USER: I prefer economy class.

ASSISTANT: Are there any more preference?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Samantha Harris.

ASSISTANT: Sorry to inform that there are no flights on your route with the given dates.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for reaching us.