You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there for you?

USER: I am William Williams. I want to book a flight ticket from HOU to ATL, can you help me with booking please?

ASSISTANT: Sure, please let me know your trip dates.

USER: My trip dates are 03/03 and 03/05.

ASSISTANT: Do you need an economy class or business class?

USER: I am ok with any class.

ASSISTANT: At what time you want to depart and return?

USER: I want to return at morning.

ASSISTANT: How many connections do you need? Thanks for providing your details, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for approaching us.