You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Karen Evans from Philadelphia.

ASSISTANT: What can I do for you Karen Evans?

USER: Can you please reserve a flight ticket on 04/26 to attend a annual day function?

ASSISTANT: Sure, may I know when do you want to return?

USER: My arrival date is on 04/28.

ASSISTANT: Could you please mention your airport codes?

USER: I want to start from my home city Philadelphia PA-PHL, my landing airport is at NC-CLT.

ASSISTANT: Ok, do you need a whistle stop?

USER: Yes, I need a whistle station to go for shopping.

ASSISTANT: Thank you for sharing your essentials. There are no flights available on your required dates.

USER: Its ok, I will search other alternative.

ASSISTANT: Thank you for opting us.

USER: Thank you.