You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: I am Robert Smith want to book a ticket to Atlanta to meet my friends, can you please help me?

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

USER: My airport codes are from DCA to ATL.

ASSISTANT: Please specify your journey dates.

USER: I want to travel on 08/26 and need to return on 08/28.

ASSISTANT: Do you have any price limit?

USER: I can afford upto 200 only.

ASSISTANT: Sorry to say that, there is no flight found on your given details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for visiting us.