You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Williams.

ASSISTANT: How can I assist you today?

USER: I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, will you please give me a moment?

USER: Ok, thank you for your response.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.