You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I got an invitation from my friend to attend for LGBT festivals on 12/02, will you please book a ticket for me?

ASSISTANT: Sure, may I know your arrival date?

USER: My return would be on 12/04.

ASSISTANT: To proceed booking I need your airport codes.

USER: I need to travel from CLT to SFO with a direct flight.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no direct flight available with your given dates.

USER: Ok, no problem.

ASSISTANT: Shall I proceed?

USER: Do not proceed.

ASSISTANT: May I know your good name?

USER: I am Elizabeth Edwards. Thank you.

ASSISTANT: Thank you have a nice day.