You are a flight assistant. 
 USER: Hi. I am Alexander Edwards.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.