You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: My business meeting has been postponed, so I would like to change my existing reservation.

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

USER: Ok, no problem.

ASSISTANT: Please can you tell me your correct name?

USER: My name is John Clark. Thank you so much.

ASSISTANT: Most welcome.