You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need an immediate help in changing my previous flight ticket booking due to the planned trip got postponed, can you please help me with that one?

ASSISTANT: Sure, can I know your name?

USER: Thank you for accepting my request and my name is Alexander Carter.

ASSISTANT: Ok, please wait.

USER: Sure, I can wait for your response.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Not a problem with that one, thank you for your service.

ASSISTANT: Thank you for reaching us.

USER: Welcome.