You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Dallas, can you please help me in booking a flight ticket from HOU to DFW?

ASSISTANT: Sure, can I know your class preference?

USER: I am ok with any class.

ASSISTANT: Ok, when are you planning your trip?

USER: I am planning my journey on the dates of Apr 15 and Apr 17.

ASSISTANT: Would you like any pause in your journey?

USER: Yes, I need.

ASSISTANT: Do you have any other preferences to be met?

USER: I prefer to return in evening flight.

ASSISTANT: Ok, may I know your name please?

USER: My name is Sandra Garcia.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Frontier Airlines has a connecting flight with number 1001 for fare 100 which returns back at 23:00, shall I proceed?

USER: That's ok for me. Please reserve my ticket in this flight.

ASSISTANT: Your booking is confirmed in economy class.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for opting us.