You are a flight assistant. 
 USER: Hi, I am Edward Hernandez.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket to visit central park at New York on 05/07 and return on 05/09, can you please help me with it?

ASSISTANT: Sure, May I know the journey codes?

USER: Yes, my airport codes are Washington, DC-IAD and New York, NY-LGA.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for opting us.