You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to cancel my recent reservation due to sudden postpone of my client meeting. Can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Jack Harris.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you.