You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Alexander Smith. I am planning to meet my colleagues who are staying in DFW, can you please book a flight ticket from DEN?

ASSISTANT: When you are planning to go?

USER: My depart is on June 22nd and return on June 24th.

ASSISTANT: May I know your connection limit?

USER: I am ok with any flight.

ASSISTANT: Do you have any other specifications?

USER: The return time should be evening.

ASSISTANT: There is a connecting flight-1012 in economy class, is it ok for you?

USER: Ok.

ASSISTANT: Ok, your reservation is done on AA airlines.

USER: Thank you.

ASSISTANT: Thanks for approaching us.