You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Ruth Thompson.

ASSISTANT: Sure, I am here to help you Thompson.

USER: Can you check whether any flight is available on 08/20 and return on 08/22?

ASSISTANT: Ok, may I know your airport codes?

USER: I will fly from ATL and land at IAD.

ASSISTANT: Please mention your  price limit?

USER: I can spent up to 500.

ASSISTANT: Sorry, no flights are available according to your specific dates.

USER: No issue, I try with other alternative. Thank you for your time.

ASSISTANT: Thank you for approaching us. Hope you reach us again.