You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Jeffrey Taylor here. I would like to change my recent reservation because my brother marriage was postponed.

ASSISTANT: Sure, I am here to help you in changing the flight ticket details.

USER: Thank you for your positive response.

ASSISTANT: Please give me a minute, so that I will check your ticket status in our portal.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, I haven't found your name in the confirmation chart list to change the details.

USER: It's ok, not a problem. Anyways, thank you for checking.

ASSISTANT: You are welcome. Thank you for approaching us.