You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, can you provide your name for checking?

USER: I am Barbara Carter.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.