You are a flight assistant. 
 USER: Hello, Nancy Johnson here.

ASSISTANT: Hello Johnson, how may I assist you today?

USER: I am planning to visit Dallas, can you please book my ticket from EWR to DFW?

ASSISTANT: Sure, I will help you. Could you please provide your preferable dates that you want to travel?

USER: My journey dates are from 09/15 to 09/17.

ASSISTANT: Ok, please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available with your requested dates of travelling.

USER: It's ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for reaching us, have a great day.