You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I best serve you today?

USER: Please help me to book a flight ticket from IAD to HOU.

ASSISTANT: Sure, can you please mention your depart and arrival dates of your journey?

USER: My travel dates are 26 to 28 of Feb.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I need a connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I prefer to travel in normal cost airline which return in the afternoon.

ASSISTANT: Can I know your good name to proceed further?

USER: I am Janet Thomas.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.