You are a flight assistant. 
 USER: Hello. I am Ryan Wilson.

ASSISTANT: Hello. What service that you are looking from our agency?

USER: I am a doctor and there is an emergency case that I have to deal in my hospital, so I need a flight ticket to reach Washington in the month of February. Can you please reserve an advance flight ticket booking for me from EWR to IAD?

ASSISTANT: Sure, I will help you with that. Can you please provide your planned dates of travelling to go there?

USER: Thank you for considering my request and I have planned my trip dates on 02/09 and return back on 02/11.

ASSISTANT: Please wait a moment to check the flights availability in your route and I will get back with a best flight for you.

USER: Sure, please go ahead and provide me the flight details if there is any flight obtained on my dates.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Sad to hear that one from your end but it's fine, I can reach another booking agency to book my flight ticket.

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

USER: Thank you for your service.

ASSISTANT: Welcome.