You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to attend sister's marriage anniversary at Denver, can you please reserve flight ticket from LAS to DEN?

ASSISTANT: May I know your travel dates?

USER: Sure, my planned travelling dates are May, 19 and 21 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No, thank you for asking.

ASSISTANT: May I know your name?

USER: Sure, my name is Jessica Turner here.

ASSISTANT: Sorry, we did not find any flights for you.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.