You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: My exams got postponed, can you please help me in cancelling my reservation?

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

USER: I am Paul Thomas.

ASSISTANT: Sorry to inform you that there is no reservation found.

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you for choosing us.