You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Emma King here. Can you search a flight from IAD - CLT?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to book a flight reservation from 11/02 to 11/04.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, please check with price limit of 200.

ASSISTANT: Sorry, there is no flight available at your requested dates.

USER: Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Most welcome.