You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. 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 in changing my reservation?

ASSISTANT: It's my pleasure to help you. May I know your name to check with the status?

USER: Thank you and myself John Walker.

ASSISTANT: John Walker, I am afraid that there is no active reservation found under your name to amend.

USER: It's ok, no issue. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching our agency.