You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Donna Gonzalez here. Could you book my flight ticket with price 200?

ASSISTANT: Sure, can you please share me your airport codes?

USER: My airport codes are ATL and CLT.

ASSISTANT: When you are planning to depart and arrive?

USER: My trip dates are March 29 and March 31.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately there are no flights found with your matching details.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.