You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Nicholas White. I am looking for a flight to visit the one of the best place in Philadelphia.Can you please aid me in making an airline reservation?

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure and arrival dates are 11/12 and 11/14.

ASSISTANT: Please let me know your airport codes?

USER: My airport codes are from IL-ORD to PA-PHL.

ASSISTANT: Thank you for your information, there are no flights available with your specified dates.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for availing with us.