You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: I am glad to help you about that. Can you please provide your name for checking the reservation status?

USER: Sure, I am Richard Campbell.

ASSISTANT: Please wait for sometime to check in our booking list.

USER: Sure.

ASSISTANT: I regret to say this Richard Campbell, there is no active reservation under your name in our booking list.

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

ASSISTANT: You are welcome, thank you for reaching us.