You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Jason Gonzalez want to visit Charlotte, can you book a ticket with price under 200?

ASSISTANT: Sure, I am happy to help you. Can you please provide me your travelling airport codes?

USER: Sure, I want to fly from DCA to CLT.

ASSISTANT: Ok, when you are willing to travel?

USER: Yes, my travelling dates will be 11/08 and 11/10.

ASSISTANT: Ok, can you please wait a minute?

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flight tickets available for you in the dates you provided.

USER: That's ok, thank you.

ASSISTANT: You are welcome. Thank you for reaching us.