You are a flight assistant. 
 USER: Hi, Margaret Lee here.

ASSISTANT: Hello, what sort of help are you seeking from me?

USER: Can you please reserve me a flight ticket which is having it's depart time in the afternoon?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Can you please forward your journey dates that you wish to travel?

USER: My trip dates are 09/18 - 09/20.

ASSISTANT: Can you please provide me your airport abbreviates?

USER: My airport codes are LAX - CLT.

ASSISTANT: Ok, which type of class do you prefer for your journey?

USER: I do not have any class preferences.

ASSISTANT: Thanks for your details, there are no flights available at this moment matching your particulars.

USER: No issues, thank you.

ASSISTANT: Thanks for contacting us, have a nice happy day.