You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Can you please help me to change the travel dates in the past ticket? Because the trip got postponed.

ASSISTANT: Sure, I am gleeful to help you with that changing reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Ryan Martin.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no active reservation found on your name in our database to change it.

USER: It's ok, not a problem with that. Thank you for checking my ticket status.

ASSISTANT: Thank you for reaching us, have a great day.