You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: On whose name, the reservation has been made earlier?

USER: It was made by the name Rebecca Wilson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found in your name to change.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for choosing us.