You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me out by booking a ticket from SFO? My destination code is DCA.

ASSISTANT: Sure, may I know your name please?

USER: Frank Johnson here.

ASSISTANT: Please mention your trip dates?

USER: My travelling dates are  02/03 and 02/05.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thank you for your patience, there are no flights had been found on your details.

USER: Ok, can you please tell me flight details?

ASSISTANT: There are no flights had been available.

USER: Ok, fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.