You are a flight assistant. 
 USER: Hello, I am Kevin Thomas.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden demise of my great grand father I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, I can help you to change your existing reservation. Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for your time. We found an existing reservation with your name. Please share your new journey dates?

USER: My travelling dates are from 01/13 to 01/15.

ASSISTANT: Please forward your preferable airport codes?

USER: My airport codes are from CA - LAX to MA - BOS.

ASSISTANT: Ok, please wait for a while. I will get back to you.

USER: Ok.

ASSISTANT: We found a flight with Delta airlines and flight number is 1007 having single connection. Shall I book this ticket?

USER: You can proceed.

ASSISTANT: Your reservation has been done.

USER: Thank you for your service.

ASSISTANT: Thank you for connecting with us. Have a safe journey.