You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to change my reservation to other dates?

ASSISTANT: Sure. May I know your name?

USER: Sure, my name is Anna Phillips.

ASSISTANT: Ok. Let me check details with your recent reservation.

USER: Sure.

ASSISTANT: I regret, there is no reservation by name Anna Phillips.

USER: No issues, thank you.

ASSISTANT: Thanks. Have a nice day ahead!.