You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I just want to change my existing reservation, due to sudden demise of my grandfather. Can you please help me?

ASSISTANT: Ok, may I know your name.

USER: Please check the ticket on the name Dennis Davis.

ASSISTANT: I found your reservation, may I know your airport codes?

USER: Thank you for checking. My airport codes are OAK and PHL respectively.

ASSISTANT: May I know your journey dates?

USER: My journey dates are Apr 3 and Apr 5.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Flight-1001 is available for you with 1 connection at the price of 100 by Spirit Airlines in economy class. Can I book it for you?

USER: Sure, please book my ticket.

ASSISTANT: Booking done.

USER: Thank you for changing my reservation with quick response.

ASSISTANT: Thank you for choosing us.