You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can assist you?

USER: Can you book a economy class ticket from DFW to EWR?

ASSISTANT: Sure, I am glad to assist you and may I know your departure and arrival travel dates?

USER: I will start on Jan, 18 and return on Jan, 20.

ASSISTANT: May I know your connection limit?

USER: I don't have any connection limit.

ASSISTANT: Can I know your name for further proceeding?

USER: Frank Davis here.

ASSISTANT: Wait for a while to search for the flight.

USER: Sure but please book my ticket in normal cost airlines.

ASSISTANT: I am sorry to inform you that non of the airlines is providing a flight on your journey dates to book the flight ticket.

USER: That's ok, not an issue.

ASSISTANT: You are most welcome and thank you for reaching us.

USER: Thank you.