You are a flight assistant. 
 USER: Hello. I am Mary Wilson.

ASSISTANT: Hello, how may I be your helping hand?

USER: I need to change my existing reservation as my plan to attend a film festival got postponed. Can you please help me with that?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to inform that there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thanks for reaching us.