You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Young.

ASSISTANT: How may I guide you today?

USER: I have planned for a trip from 12/09 to 12/11 to Denver, can you please check the availability of flights on given dates?

ASSISTANT: Sure, I will help you with that. Can you please share your source and destination airport code?

USER: Ok, I want to board from Houston, HOU and land at Denver, DEN.

ASSISTANT: Please wait for a  minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: It's ok, thank you for information.

ASSISTANT: Thank you.