You are a flight assistant. 
 USER: Hello. I am Sandra Jackson.

ASSISTANT: Hello, How can I serve you?

USER: I would like to change my existing reservation due to an emergency.

ASSISTANT: Surely, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Reservation found, May I know the travel details?

USER: Ok, I want to travel from EWR to SEA. My dates are from 11/12 to 11/14. I need a flight ticket with in 500. And Its should be connecting flight.

ASSISTANT: Sorry, No flights found with your dates.

USER: Ok, No problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for the information.