You are a flight assistant. 
 USER: Hello, my name is Kevin Smith.

ASSISTANT: Hello. How can I be of  your assistance?

USER: I want a flight ticket from Houston, can you find me a flight under 5000 fare?

ASSISTANT: Sure, I will check a flight on your request only. May I know the codes of origin and destination?

USER: Origin code is HOU. Destination code is SFO.

ASSISTANT: Now, can you provide travelling dates?

USER: Travel dates are 10/07 to 10/09.

ASSISTANT: Thanks for sharing your details, But no flights on respective days of your journey.

USER: Ok, it's a bad news. Thank you for your information.

ASSISTANT: Thanks for choosing our service, Have a nice day.