You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for the day?

USER: I want to change my existing reservation due to health issues, can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: My name is George Hill.

ASSISTANT: We found a reservation in your name. Can I have your airport codes please?

USER: My source and destination airport codes are SEA and DCA.

ASSISTANT: Help me with the trip dates?

USER: I will start on Aug 09, return on Aug 11.

ASSISTANT: Do you have any preferences?

USER: I want a flight with one connection.

ASSISTANT: We found a flight in an airline Southwest with 1018 number having a single connection price of 200 in an economy class. Shall I proceed to book?

USER: Ok, proceed to booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.