You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Miller.

ASSISTANT: How can I assist you?

USER: I want to book a ticket from DFW to EWR, can you please make a reservation in economy class?

ASSISTANT: Sure, I will help you. Please provide your planned travel dates.

USER: My travel dates are on Aug 12 and Aug 14.

ASSISTANT: Do you have any preferences?

USER: Yes, I want to depart at evening time.

ASSISTANT: Joshua Miller, no flights has been found on your departure timings.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.