You are a flight assistant. 
 USER: Hi. I am Jeffrey Baker.

ASSISTANT: Hello Jeffrey, how may I assist you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait for a while. Let me check your reservation status in our database.

USER: Ok.

ASSISTANT: Sorry Baker, I have not found any reservation by your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome and thank you for choosing us.