You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Benjamin Adams here.

ASSISTANT: Nice to meet you.

USER: Can you change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: That's fine.Thank you so much.

ASSISTANT: You are welcome.