You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I planned to meet my friend in HOU, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, may I know your travelling dates please?

USER: I prefer to travel on Jun 29 and Jul 01.

ASSISTANT: Can you please share your connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can you please let me know your name for booking purpose?

USER: I am James Roberts.

ASSISTANT: James Roberts, there are no flights available in your route with your preferences.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.