You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you today?

USER: Due to some client meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: May I know your good name please?

USER: Myself Gregory Wright.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is no reservation found with your given name.

USER: Not a big problem, anyhow thank you very much for your kind service.

ASSISTANT: Thank you for availing us.