You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I'm Paul Robinson from Dallas, I want to change my reservation for some weather issues. Will you please help me out?

ASSISTANT: Yes, I will help you. Please give me a minute.

USER: Sure.

ASSISTANT: Sorry Paul, there is no reservation found for this search.

USER: Ok, no problem.

ASSISTANT: Do you want to know anything else from me?

USER: Thank you for the information.

ASSISTANT: Ok, thank you have a nice day.