You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Johnson.

ASSISTANT: Ok.

USER: Can you please book me a ticket from IAD to DEN to meet my friends?

ASSISTANT: Sure, May I know on which dates you are willing to travel?

USER: I would like to leave between 06/10 and 06/12.

ASSISTANT: Ok, do you require any stopovers in your journey?

USER: Yes, I need a halt.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Ok.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thank you so much.