You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Pamela Jones. Please help me to book a flight ticket from HOU to IAD.

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are from Oct, 14 to Oct, 16.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Please share me your other preferences.

USER: I need to return in the evening.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of you journey.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for approaching us.