You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you reserve me a ticket from DCA to LAX?

ASSISTANT: Sure, May I know the travelling dates?

USER: My trip dates are Jan 18 to 20.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other requirements?

USER: My depart time is in afternoon.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: May I know your name?

USER: Linda Collins here.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for opting us.