You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa King, I want to change my reservation as my plan for round trip to St Paul is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, I will help you. May I know your name? Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Thank you for the information.

ASSISTANT: Thank you so much.