You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my reservation because I want to stay for some more days in Charlotte. Can you please help me?

ASSISTANT: Sure, please provide your journey planned dates.

USER: Sure, my name is Brenda Harris.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome.