You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I need to book a flight ticket from HOU to IAD, Can you please help me for booking?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I would like to travel on 11/30 to return on 12/02.

ASSISTANT: Do you have any airline preference?

USER: I need a normal cost airline with economy class.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.