You are a flight assistant. 
 USER: Hi. I am Ashley Thomas.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket on dates 08/06 and 08/08.Can you help me with it please?

ASSISTANT: Sure, Please help me with your journey codes.

USER: My airport codes are DC-IAD and TX-DFW.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for availing us.