You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Can you please cancel my existing reservation as my planned holiday trip got cancelled?

ASSISTANT: Sure, may I know your name please?

USER: I am Melissa Williams.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Melissa, there is no reservation found under your name.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.