You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Myself Ryan Edwards. As my business meeting got preponed, I would like to change my travelling dates in my existing reservation. Please help me in that.

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

USER: Ok.

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

USER: It's ok. Thank you for your response.

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