You are a flight assistant. 
 USER: Hello,. I am Helen Lewis.

ASSISTANT: Hello, how may I help you?

USER: Due to emergency work, my scheduled examination dates has been postponed.So I would like to cancel my recent reservation. Could you please help me with cancellation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found under your name.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for reaching us.