You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Walker.

ASSISTANT: How can I assist you today?

USER: Could you please book a flight ticket from SFO to ATL?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you, I want to take off on May 31 and please confirm my return ticket also on June 02.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.