You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please reserve me a flight ticket from DFW to PHX?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are July 29 and July 31.

ASSISTANT: Do you have any other specifications?

USER: My return time is afternoon.

ASSISTANT: Please help me with your name for booking.

USER: I am Joshua Hernandez.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.