You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Elizabeth Hill here. My holiday vacation has been postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Give me a second.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: No problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.