You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help 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 in changing my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you mention your name to check further?

USER: Myself Alexander Hall.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

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

ASSISTANT: Thank you for contacting us.