You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Clark.

ASSISTANT: How may I help you?

USER: I would like to meet my friend at Los Angeles, can you please reserve me a flight ticket to reach LAX?

ASSISTANT: Sure, may I know your trip dates?

USER: I am planning to start my journey on Mar 26 and return on Mar 28.

ASSISTANT: May I know your source location?

USER: My take off airport code is DCA.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need a stopover in between my journey.

ASSISTANT: Do you have any specifications?

USER: No, I am not having any other specifications.

ASSISTANT: Sorry, there are no flights found on your travel dates.

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

ASSISTANT: Thank you for reaching us.