You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Linda Collins here. Could you change my reservation?

ASSISTANT: Sure, may I know your name?

USER: Linda Collins here.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.