You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed.

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Sure, Donna Hernandez here.

ASSISTANT: Please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no active reservation your name to change.

USER: Oh! That's ok, thank you giving the information anyways.

ASSISTANT: Thank you for reaching us.