You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephen Robinson here.

ASSISTANT: How can I help you at this moment?

USER: My exam got postponed to next week, can you help me to change my reservation?

ASSISTANT: Ok Stephen, can I put on hold for a few seconds?

USER: Please check.

ASSISTANT: Sorry Stephen, no reservation found on your name. Do you need any other help?

USER: No. Thank you for your help.

ASSISTANT: Thank you for contacting  us.