You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to enquire about the flights from Philadelphia to Charlotte because I need to attend my niece birthday function. Can you please help me for that?

ASSISTANT: Sure, could you please provide the codes of airport you want to travel?

USER: My airport codes are from PHL to CLT.

ASSISTANT: Ok, may I know your travelling dates to search for the flight?

USER: My departure date is 12/13 and return date is 12/15.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, no flights were available on your dates.

USER: My name is Christine Johnson. Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.