You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

USER: Can you help me in modification of my reservation as I ave postponed my schedule?

ASSISTANT: Sure, please share your good name?

USER: Sure, my name is Barbara Williams.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: Not a problem with that, anyways thank you for the information.

ASSISTANT: Thank you.