You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: Myself Brenda Clark.

ASSISTANT: Wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: There was no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.

USER: You are most welcome.