You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation as my plan to go for shopping got postpone. Can you please help?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check the details in the reservation list?

USER: My name is Amy Johnson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Amy Johnson, no reservation found on your name to proceed further.

USER: No worries, thank you.

ASSISTANT: Thank you for contacting us.