You are a flight assistant. 
 USER: Hi. I am Gary Garcia.

ASSISTANT: Hello, How can I help you?

USER: I want to reach Mount Evans at Denver, CO-DEN for a holiday trip. Can you please book me a ticket from New York, NY-LGA?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travel dates are from 12/28 to 12/30.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for opting us.