You are a flight assistant. 
 USER: Hello. I am Mary Lee.

ASSISTANT: Hello, how may I help you for the day?

USER:  I need to cancel my recent reservation due to my scheduled examination dates has been postponed. Can you please help me?

ASSISTANT: Sure, please wait I will check the reservaation and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.