You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking a flight ticket from LAS to IAD?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Myself Amy Clark.

ASSISTANT: Please help me with your planned travelling dates.

USER: I want to fly on July 22 and return on July 24.

ASSISTANT: Do prefer to have a break in your journey?

USER: I need a single connection.

ASSISTANT: Please help me with your preferred class to fly.

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences in your journey?

USER: I would like to depart in the evening time.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Amy Clark, I am really sorry to inform you that there are no flights available for your journey.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.