You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I be of your help?

USER: I need to attend an interview in New York, LGA. Can you please book  ticket for me?

ASSISTANT: Sure, please provide me your travel dates.

USER: My journey start on 06/20 and I return on 06/22.

ASSISTANT: Kindly mention your boarding airport.

USER: My boarding point is Denver, DEN.

ASSISTANT: Sorry for the inconvenience, there are no flights on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Can I know your name please?

USER: My name is Carolyn Martinez.

ASSISTANT: Thank you, have a good day.