You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Due to changes in my plan I need to change my previous flight booking. Please help me.

ASSISTANT: Sure, I am here to help you. May I know your name please to proceed further?

USER: Andrew Martinez here.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: I found your reservation, could you please share me your airport codes?

USER: LGA and PHL are the airport codes.

ASSISTANT: Let me know your travel dates please?

USER: February 6 and 8 are the planned travel dates.

ASSISTANT: Do you need any other specifications?

USER: I need a direct flight.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: That's ok. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.