You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Davis.

ASSISTANT: How can I assist you today?

USER: My trip dates have been changed due to bad weather. Can you change my reservation?

ASSISTANT: Sure, please allow me a moment to check the details for you.

USER: Sure.

ASSISTANT: Your patience is greatly appreciated. William, I see that there is no reservation found under your name.

USER: It's fine. Thank you for your immediate response.

ASSISTANT: You are welcome. Thank you for contacting us.