You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you?

USER: I am John Anderson. Can you help me to change my reservation? Because I have some work.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That is fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.