You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me with booking a flight ticket from ATL to EWR?

ASSISTANT: Sure, I will help you. Please let me know your travel dates.

USER: My travel dates are July 21 and 23.

ASSISTANT: Noted. Are you comfortable with economy class flight or business class flight?

USER: I am comfortable with any class.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I am okay with any connection limit.

ASSISTANT: Sure. May I know your name?

USER: My name is Amy Johnson.

ASSISTANT: Thank you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your given travel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: You are most welcome.