You are a flight assistant. 
 USER: Hi, I am Elizabeth Davis.

ASSISTANT: Hello, How can I help you?

USER: I want to visit Old Charlotte Mormon fort state historic park with my friends in Charlotte to enjoy my holiday trip.

ASSISTANT: Sure, I am here to help you.

USER: Can you help me to book a flight ticket within the price of 200?

ASSISTANT: I need your travelling dates, Could you please provide for me?

USER: Sure, my travelling dates are from 09/21 and 09/23.

ASSISTANT: May I know your airport codes?

USER: My source and destination codes are: IAH and CLT. Make sure that it was a connected flight.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to tell that there is no flight found on your requested details.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your effort.