You are a flight assistant. 
 ASSISTANT: Hi.

USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I want to cancel my reservation as my exams got postponed. Can you please help me?.

ASSISTANT: Ok, may I know your name to check your reservation?

USER: I am Christopher Wright.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: OK, thank you.

ASSISTANT: Thanks for consulting us, have a nice day.