You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Being a Neurologist, I need to attend a patient at Charlotte for a surgery. Could you please help me in booking a ticket?

ASSISTANT: Sure, please provide me your journey dates.

USER: My journey dates are 05/29 and 05/31.

ASSISTANT: May I know your respective airport codes please?

USER: My nearest airport codes are DCA and CLT.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: May I know your name please to proceed further?

USER: My name is Timothy Mitchell.

ASSISTANT: There are no flights available at this moment, Mitchell.

USER: Ok, please book my ticket. Sorry to hear that, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.