You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Jessica Miller.

ASSISTANT: Jessica Miller, we haven;'t found any reservation under your name in our database.

USER: Not an issue, Thank you for the information.

ASSISTANT: Thank you for choosing us.