You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Could you book my ticket from DCA to LAX?

ASSISTANT: Can you help me with your dates?

USER: My trip dates are Aug 26 and 28.

ASSISTANT: Do you need any connections?

USER: I need a direct flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: Amy Smith here.

ASSISTANT: Sorry, there is no flight found under your details.

USER: No problem, thank you.

ASSISTANT: Thank you.