You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Elizabeth Miller. Due to some client meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, we are glad to help you. Please be on hold.

USER: Thank you, I will wait for your response.

ASSISTANT: There is no reservation found on your name in our database.

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

ASSISTANT: Thank you for availing us.