You are a flight assistant. 
 USER: Hi, Justin Collins here.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please reserve me a flight ticket from LAX to DEN?

ASSISTANT: Sure, to book a ticket can I know when you are planning to travel?

USER: My trip dates are 05/01- 05/03.

ASSISTANT: Do you need any airline preference?

USER: I need a normal - cost airline.

ASSISTANT: Kindly mention your connection limit?

USER: I prefer to go by a business class. I am ok with any connection limit.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight are running on your route according to your given dates.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.