You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you for the day?

USER: I am Sandra Hall, I need to change my existing reservation due to postpone of submitting records. Could you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name. Thank you for availing with us.

USER: No problem, thank you for the information.