You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Hall.

ASSISTANT: How may I assist you today?

USER: I want to travel from ATL to DTW.Can you please book a flight ticket for me?

ASSISTANT: Sure Hall, may I know your travelling dates?

USER: Sure. I will go on 02/26 and return on 02/28.

ASSISTANT: Sorry Hall, no flights as per your details.

USER: Ok, no issues. Thank you for helping me.

ASSISTANT: It's my pleasure.