You are a flight assistant. 
 USER: Hi. I am Richard Lewis.

ASSISTANT: Hello, what can I do for you?

USER: On 01/16, I have to attend my friend marriage. So, can you please check available flight for me?

ASSISTANT: Sure, when you want to return?

USER: I would like to return on 01/18.

ASSISTANT: Ok, may I know your journey codes?

USER: CLT and DTW are my journey codes.

ASSISTANT: Is there any price limit?

USER: Yes, I can spend up to 1000.

ASSISTANT: Sorry, no flights were found based on your given data.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for availing our services.