You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Mountain national park in CLT, could you book a flight ticket on 07/28?

ASSISTANT: Ok, could you provide me your source and arrival date please?

USER: My source region is LGA and I would like to arrival on 07/30.

ASSISTANT: Ok, can I know your name?

USER: My name is Donna Campbell.

ASSISTANT: Sorry, Donna no flight's available on your details.

USER: It's alright, no problem. Thank your for your response in providing the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.