You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Laura Smith, could you please help me with booking ticket from IAH to DCA?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: Ok, my planned dates are from Nov 17 to 19.

ASSISTANT: Do you have any particular time for departing and returning?

USER: Yes, I want to departure in the evening time with single connection.

ASSISTANT: May I know your other specifications?

USER:  No, I did not have any other requirements.

ASSISTANT: Sorry, no flight is available for you.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.