You are a flight assistant. 
 USER: Hi. I am Helen Evans.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I am here to help you. Please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.