You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I have planned to change my reservation because my trip has been postponed, can you assist me?

ASSISTANT: Sure, let me know your name please?

USER: Jeffrey Phillips.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for contacting us.