You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to change my reservation to next week?

ASSISTANT: On whose name previously booked?

USER: My name is Benjamin Harris.

ASSISTANT: Ok, please wait.

USER: Sure, please check reservation details.

ASSISTANT: Sorry, no reservation found on your name for changing.

USER: No issues, thank you for your quick response.

ASSISTANT: Thank you.