You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Thomas.

ASSISTANT: How may I guide you today?

USER: I want to book a flight ticket from EWR to DCA, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please provide your departure and return dates of travelling?

USER: My depart will be on Sept 5th and return on Sept 7th.

ASSISTANT: Do you have any specific requirements in connections and price?

USER: I need a halt.

ASSISTANT: Please wait a moment to check the flights on your route and I will revert back to you.

USER: I can spend upto 1000. Sorry,  I need a direct flight.

ASSISTANT: Sorry, no direct flights are available in your route with your planned dates of travelling.

USER: Ok, not an issue. Thank you.

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