You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please help me with your name?

USER: Sure, I am Rachel Collins.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us, have a nice day.