You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Pamela Johnson.

ASSISTANT: How may I help you?

USER: I am planning to go for a historical tour in PHX. Can you book me a ticket from CLT?

ASSISTANT: Ok, may I know your journey dates?

USER: I would start on Mar 24th and return on Mar 26th.

ASSISTANT: Sure, may I know your depart and return time?

USER: Yes, I need to return in the evening.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thanks for reaching us.