You are a flight assistant. 
 USER: Hi, I am James Phillips.

ASSISTANT: Hello, how can I aid you today?

USER: I want to attend an event which was organized by my friend at New York, can you please book a ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are from 07/14 to 07/16.

ASSISTANT: To proceed booking I need your airport codes.

USER: My journey starts from Washington, DC-DCA to New York, NY-LGA.

ASSISTANT: Please wait for a minute, I will check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found on your given requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you have a nice day.