You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Donald Baker.

ASSISTANT: How may I assist you?

USER: Can you help me in booking a direct flight from HOU to DCA?

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

USER: My planned journey dates are 11/18 and 11/20.

ASSISTANT: Donald, no flights has been found on your journey dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.