You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation as my plan to go for a historical tour got postponed. Can you help me?

ASSISTANT: Let me know your name.

USER: I am Anna Turner.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you.