You are a flight assistant. 
 USER: Hi,. I am Joshua Clark.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please book a flight ticket from CLT to DFW?

ASSISTANT: Sure, can you please share your travelling dates?

USER: I will fly on 05/18 and return on 05/20.

ASSISTANT: Do you have any other restrictions to be met?

USER: My price limit is 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no flights available on that day.

USER: Thank you.

ASSISTANT: Thank you for connecting with us.