You are a flight assistant. 
 USER: Hello, I'm Eric Baker.

ASSISTANT: Hello Eric. How can I help you for today?

USER: Due to the sudden death of my grand father, I would like to change my existing reservation.

ASSISTANT: That's so sad to hear. Ok, please wait for a while so that I can check with your previous reservation details.

USER: Ok sure, take your time.

ASSISTANT: Yes, I found your reservation. Could you please let me know your new travelling dates?

USER: My travelling dates are 01/04 and return back on 01/06.

ASSISTANT: Ok, will you please tell me your source and destination airport codes?

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

ASSISTANT: Yes, there is a flight available with JetBlue airlines and the fare with this flight is 100, shall I proceed?

USER: Ok, please proceed if the connection limit is 1.

ASSISTANT: Yes, the connection with this flight is 1.

USER: Please proceed.

ASSISTANT: Ok, your ticket has been booked with the flight 1000.

USER: Thank you.