You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Sarah Williams here. I'm planning to visit my farmhouse at PHL, can you please book a ticket from CLT?

ASSISTANT: Sure, May I know the travel dates?

USER: Sure, my planned departure and return travel dates are 11th and 13th of May.

ASSISTANT: Please wait a minute.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's fine, thank you for giving the information.

ASSISTANT: Thank you for opting us.