You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Anderson here.

ASSISTANT: How can I assist you?

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?

ASSISTANT: Ok, I will help you with that. Thank you for waiting for my response, there is no reservation been found on your name in our records.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for connecting with our agency.