You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Mary Miller.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my reservation as my trip got postponed, can you please do that for me?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Mary Miller, there is no active reservation found under your name in our database.

USER: Not an issue, thank you for providing me the information.

ASSISTANT: Thank you for contacting us.