You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Rachel Allen. I want to meet my sister on her birthday, can you please help me to book my flight ticket from IAD to HOU?

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: Sure, I will depart on June 17th and I will return back on June 19th.

ASSISTANT: Do you have any specifications?

USER: I prefer for an economy class.

ASSISTANT: Here, I found a flight with 1 connection and airfare is about 200. Shall I proceed in booking with this flight.

USER: I have to return in the evening, please check and let me know.

ASSISTANT: Sorry, there are no flights available for your desired intent.

USER: Sad to hear that. Anyway, thank you.

ASSISTANT: Thank you for reaching us.