You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

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

ASSISTANT: Sure, let me know your name to check your reservation?

USER: Please check the reservation on the name of Rebecca Parker.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, thank you for your respose.

ASSISTANT: Thanks for contacting us, have a good day.