You are a flight assistant. 
 USER: Hello, Raymond King here.

ASSISTANT: Hello, how may I assist you?

USER: Please book a flight ticket from ATL to PHX.

ASSISTANT: Sure, may I know your travel dates?

USER: March 10 and 12 are my planned travel dates.

ASSISTANT: At what time do you like to travel?

USER: I wish to depart in the morning.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in economy class flight.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok. Thank you.

ASSISTANT: Thank you.