You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: I am Sandra Nelson.

ASSISTANT: How can I aid you?

USER: As my board meeting has been postponed, help me in changing my resent reservation.

ASSISTANT: Sure, please wait a moment. Sorry, we did not found any reservation with your name.

USER: No issues, Thank you for your quick response.

ASSISTANT: Thanks for choosing us.