You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How could I support you at this moment?

USER: I am Stephanie Carter want to attend a emergency surgery in Philadelphia. Can you make a reservation with a direct flight?

ASSISTANT: Sure, on what dates you are interested to travel?

USER: My itinerary dates are 09/09 - 09/11.

ASSISTANT: Ok, how much you can afford for a flight ticket?

USER: I can spend up to 500.

ASSISTANT: Ok, please share your corresponding airport codes?

USER: Sure, I will start from DWT and return from PHL.

ASSISTANT: Ok, wait for a minute, let me check with the availability of flights.

USER: Sure.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, I will choose other airline. Thank you for your information.

ASSISTANT: Thank you for reaching us.