You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you right now?

USER: Kelvin Clark here. 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: Clark, I understand your request and will be happy to help you. Thank you for waiting, there is no reservation matching with your name in our portal to make changes further.

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

ASSISTANT: Thank you for consulting us. If any questions arise, please feel free to contact us at any time.