You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samuel Thompson.

ASSISTANT: How can I help you?

USER: I am looking for a flight from DCA to LAS, can you help me out?

ASSISTANT: Let me know your travelling dates?

USER: My trip dates are from 06/10 till 06/12.

ASSISTANT: Do you need halt in between your journey?

USER: No, I need direct flight.

ASSISTANT: Sorry, no flight found for your travelling dates.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thanks.