You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I'm planning to visit Houston, can you please book the ticket from DFW to HOU?

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

USER: Sure, my planned departure and arrival travel dates are 7th and 9th of June.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer single connected flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: I want to depart in the evening time.

ASSISTANT: May I know your name for the booking process?

USER: My name is Nancy Smith.

ASSISTANT: Sorry, no flights are available on your specified dates.

USER: Oh! That. Oh! That's ok, thank you for giving the information.

ASSISTANT: Welcome, thank you for reaching us.