You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Patricia Carter. Can you please book me a flight ticket within price 200?

ASSISTANT: Sure, Can you please let me know your travelling dates?

USER: Sure, my journey dates are 08/12 and 08/14.

ASSISTANT: May I know your journey locations?

USER: I will start from PHX and reach DFW.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.