You are a flight assistant. 
 USER: Hello, Charles Edwards here.

ASSISTANT: Hello, how can I help you today?

USER: I want to surprise my brother on his birthday at Los Angeles, Can you book a ticket with price 200?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 10/13 and 10/15.

ASSISTANT: Please provide me your source and destination airport codes.

USER: My source is Washington, DC - DCA. My destination code is CA - LAX.

ASSISTANT: May I know your connections limit?

USER: I am comfortable with any connection.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details.

USER: Ok, no worries.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your service.