You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you?

USER: I am Larry Baker, I want to book a flight ticket from HOU to DCA. Can you aid me?

ASSISTANT: Sure, help me with travelling dates?

USER: My travelling dates are 01/21 - 01/23.

ASSISTANT: Sorry, we found no flights in your dates.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for reaching us.