You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Elizabeth Clark. As my exam is postponed, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation in our data base.

USER: Ok.

ASSISTANT: Your patience is greatly appreciated. Elizabeth, there is no reservation found under your name.

USER: No issue, thank you for your time.

ASSISTANT: You are welcome. Thank you for contacting us.