You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?I.

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Myself Brandon Patrker.

ASSISTANT: Please wait for a moment, while I check for your reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, I found your reservation in our system data. Please share your airport codes?

USER: My airport codes are from SFO to EWR.

ASSISTANT: Please mention your planned journey dates?

USER: My travel dates are from 03/22 to 03/24.

ASSISTANT: Please mention your connection limit?

USER: My connection limit is 1.

ASSISTANT: Do you have any other requirement?

USER: No.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: It's ok, thank you so much.

ASSISTANT: Thank you for reaching us, have a nice day ahead.