You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Timothy Hernandez here.

ASSISTANT: How can I aid 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: Sure, please allow me a moment to check for the status.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

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

ASSISTANT: Thank you for reaching us.