You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Actually I made a reservation for a trip with my friends but it got post pone so I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, May I know your name?

USER: I am Andrew Mitchell.

ASSISTANT: Sorry, No reservation found on your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for availing us.