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

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me with changing my reservation to new travel dates?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found with the given name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you.