You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Joshua Baker. My business meeting was postponed, so I want to change my existing reservation.

ASSISTANT: OK, please wait for few minutes.

USER: Will you help me in changing reservation?

ASSISTANT: Sorry, to say you that there is no reservation found with your name.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you, for reaching us.