You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Nicholas Campbell. I would like to travel from LGA to DCA to meet my parents, can you help me in booking?

ASSISTANT: Sure, could you please share your travelling dates?

USER: I am departing on 06/17 and return on 06/19.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight available as per your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.