You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to watch Baseball match in CLT, so could you book a ticket from IAD? My travel dates are 05/09 and 05/11.

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Make sure the ticket price does not exceed 200.

ASSISTANT: I am sorry to say that there is no flight with your requirements.

USER: It's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for assisting me.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Catherine Harris.

ASSISTANT: Thank you for providing your name, have a nice day.