You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I would like to book a flight ticket from Seattle to visit one of the best place in Denver. Can you please help me in making an airline reservation?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are Mar 9th and Mar 11th.

ASSISTANT: Do you have any airline preference?

USER: I prefer to travel with normal cost.

ASSISTANT: May I know your source airport name?

USER: My source airport is Seattle.

ASSISTANT: May I know your name?

USER: This is Nancy Collins.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No issues. Thank you.

ASSISTANT: You are welcome, have a nice day.