You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Actually my exam is postponed so that I want to chancel my recent reservation, can you help me?

ASSISTANT: Sure, may I know your good name please?

USER: Yes, I am Jonathan Martinez.

ASSISTANT: There is no reservation found under your name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for choosing us.