You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have to visit my Doctor who is residing at DFW for a regular check up. Please help me by booking a flight ticket.

ASSISTANT: Sure, may I know your good name please?

USER: Myself Benjamin Thompson.

ASSISTANT: From where do you want to depart?

USER: I will depart from IAH.

ASSISTANT: Do you need any connecting flight or direct flight?

USER: I prefer to have a break in my journey.

ASSISTANT: Which airline do you prefer?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: Can I know your travelling dates?

USER: May 19 and 21 are my planned travel dates.

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

USER: Oh! I will reach my destination through other source. Thank you.

ASSISTANT: Thank you for reaching us.