You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

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

USER: My name is Ryan Moore.

ASSISTANT: Please wait for a while.

USER: Ok, take your own time.

ASSISTANT: Thanks for your time, we are regret to inform you that, there is no active reservation found in your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for availing us.