You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Joshua Edwards here. Can you please help me in booking the ticket from DEN to IAH? As I have to attend a wedding reception over there.

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: Sure, I would like to depart from here on 08/22 and return by 08/24.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for giving the information.

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