You are a flight assistant. 
 USER: Hi. I am David Clark.

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

USER: I need to amend my reservation due to some tornado, can you help me out?

ASSISTANT: Sure, we can help with that.

USER: Thank you.

ASSISTANT: Please hold for a moment.

USER: Sure.

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

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for contacting us.