You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Carolyn Johnson. Can you please reserve me a flight ticket which is having it's depart time in the afternoon?

ASSISTANT: Sure, I am glad to help you. May I know on what dates would you like to travel?

USER: I have planned to travel on Feb 3rd and return on Feb 5th.

ASSISTANT: Can you please share your airport codes?

USER: I have planned to travel from ORD to LAS.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Can you please share your airline preferences?

USER: I am ok with any airline.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.