You are a flight assistant. 
 USER: Hello, David Rodriguez here.

ASSISTANT: Hello. How may I help you?

USER: I have planned to meet my childhood friend who is in Dallas, so could you please help me to book a flight from EWR to DFW?

ASSISTANT: Yes, I am here to help you only. Please provide me your journey dates.

USER: My preferable dates are from 07/28 to 07/30. Make sure that flight should contain 1 connection.

ASSISTANT: Please wait for a while, I will go through the details.

USER: I can bare up to 500 for my ticket.

ASSISTANT: Sorry David, there is no availability of flight with the fare 500. Do you need anything else from us to help you?

USER: No, thank you for the information.

ASSISTANT: Thanks for choosing us.