You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you aid me to book a ticket from PHX to DFW?

ASSISTANT: Sure, may I know the planned travel dates?

USER: My travel dates are Aug 21 and Aug 23 respectively.

ASSISTANT: Please provide me the name.

USER: Melissa Williams here.

ASSISTANT: Do you have any connection limit for this journey?

USER: I prefer for lay by in between my journey.

ASSISTANT: Do you have any specification in timings for this journey?

USER: My arrival time should be in the afternoon.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.