You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I best aid you now?

USER: I would like to make a reservation from 05/27 to 05/29, please help me with booking.

ASSISTANT: Sure, I am here to help you. Do you need any way station in between journey?

USER: I need a flag stop in between my journey.

ASSISTANT: Can you please let me know your airport codes?

USER: I want to start from DCA to SFO.

ASSISTANT: May I know your good name please?

USER: I am Jefferey Martinez.

ASSISTANT: Ok, please wait for a while.

USER: oK.

ASSISTANT: Sorry there is no flight found on your connection details.

USER: Fine, thanks for the information.

ASSISTANT: Thanks for opting us. Have a nice day.