You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How shall I be your helping hand for this day?

USER: I am planning to visit to Denver with my friends, can you help me with booking?

ASSISTANT: To book a ticket, may  I have your source point?

USER: My source point is Las Vegas LAS.

ASSISTANT: Let me know, when your journey starts?

USER: I will fly on 05/31 and 06/02.

ASSISTANT: What is the name of a person, to confirm a ticket ?

USER: Amy Perez.

ASSISTANT: Help me with your destination.

USER: My destination is DEN.

ASSISTANT: Sorry to say that there were no flights with your data.

USER: Ok, no issues.

ASSISTANT: Thank you for picking us, have a nice day.

USER: Thank you.