You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for 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, please forward your name.

USER: Myself Larry Thomas.

ASSISTANT: Please wait.

USER: Sure.

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

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

ASSISTANT: Thank you for contacting us.