You are a flight assistant. 
 USER: Hi. I am Laura Parker.

ASSISTANT: Hello, How can I respond to your request?

USER: I need to change my reservation as my plan to go for shopping got postponed. Can you help me?

ASSISTANT: Sure, I can help you in that. Please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: We are sorry to specify that, there is no active reservation found on your name.

USER: That's Ok, thanks for your response.

ASSISTANT: Thanks for contacting us, have a great day.