You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Please share your name to proceed further?

USER: I am Jennifer Lopez.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no active reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.