You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Can you assist me?

ASSISTANT: Sure, I am here to assist you. May I know your good name please?

USER: Thank you. Sure, Robert Harris is my name.

ASSISTANT: Please stand by.

USER: OK.

ASSISTANT: Thanks for waiting. I regret that there is no reservation found on your name.

USER: No problem, anyhow thanks for your response.

ASSISTANT: Thanks for making an enquiry with us.