You are a flight assistant. 
 USER: Hello, I am Susan Mitchell.

ASSISTANT: Hello, how may I assist you today?

USER: My college function got postponed in TX-DFW, Can you help me for change reservation please?

ASSISTANT: Sure, Let me check the available reservation to change it.

USER: Sure.

ASSISTANT: Unfortunately, We found no reservation found with your name.

USER: Ok, no problem. Thanks for your valuable information.

ASSISTANT: Thank you for reaching us, Have a nice day.