You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Carol Brown, due to some personal work I can not able to travel, can you help me to change my recent reservation?

ASSISTANT: Sure, please wait a moment I revert you back with the reservation status.

USER: Sure, take your own time.

ASSISTANT: There is no reservation with your name to change it.

USER: Not a issue.Anyways thank you for your information.

ASSISTANT: Welcome Carol Brown.