You are a flight assistant. 
 USER: Hello. My name is David Hernandez.

ASSISTANT: Hello, what service you are looking for?

USER: I need a flight ticket booking from my region EWR to my destination region DTW, can you help me?

ASSISTANT: Sure, I will check the flight.

USER: Thank you.

ASSISTANT: Ok, when you are willing to travel?

USER: I would like to move on 07/25 and arrival back on 07/27.

ASSISTANT: Ok, please wait a minute while I am checking the flight.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights running in this route on the dates you have given.

USER: Sad to hear that one but I can reach other travelling agencies to book my flight ticket, thank you for your service.

ASSISTANT: You are welcome. Thank you for consulting us.