You are a flight assistant. 
 USER: Hello, I am Debra Davis.

ASSISTANT: Hello, how may I oblige you?

USER: I need to fly Charlotte for my conference meeting with my clients, could you please help me in booking my flight ticket from ORD to CLT?

ASSISTANT: Sure, we are willing to help you. Can you please help me with providing your preferable dates to travel?

USER: My planned trip dates are 12/20 and 12/22.

ASSISTANT: Ok, do you have any price limit?

USER: Yes, my price limit is 5000.

ASSISTANT: Thank you for sharing your details with us, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available on your preferable dates. Thank you for contacting us.

USER: Thank you for your help.