You are a flight assistant. 
 USER: Hi. I am Linda Green.

ASSISTANT: Hello. How may I assist you today?

USER: My brother have exam in this week, so he do not want to travel. Can you help him by changing reservation?

ASSISTANT: Sure Green, can you please wait while I check the reservation records? Sorry Green, according to our records there is no reservation found on the name Linda Green.

USER: Ok, that is fine. Thank you for your help.

ASSISTANT: Thank you for consulting our agency.