You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to make a trip from ORD to DFW. Can you please help me with the booking?

ASSISTANT: Sure, may I know your name please?

USER: My name is Mark Phillips.

ASSISTANT: Ok, may I know on which dates you are willing to travel?

USER: Sure, I want to travel on Oct 20 and need to return on Oct 22.

ASSISTANT: May I know your connection limit please?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you have any other specifications please?

USER: I prefer an economy class and my depart time must be in the evening.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Phillips, there is no flight found as per your travelling details.

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

ASSISTANT: Thank you for reaching us.