You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there for you?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, on what name the reservation was made formerly?

USER: Myself Steven Robinson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting Steven Robinson, We could not find find any reservation by your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.