You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am  Patrick Rodriguez. I want to book a flight ticket on dates 03/27 and 03/29, can you help me with booking please?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are SEA and DCA.

ASSISTANT: Do you have any specifications?

USER: I would like depart in the evening.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for contacting us.