You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Deborah Robinson 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 to the trip. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your details, Robinson.

USER: That's fine, thanks for your help and valuable information.

ASSISTANT: Thank you for contacting us.