You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Jonathan Nelson.

ASSISTANT: Thank you. Please be online for a while, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: I am sorry, there is no reservation found under your name in our database.

USER: That's ok, thank you.

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