You are a flight assistant. 
 USER: Hello, I am Margaret Smith.

ASSISTANT: Hello, how may I oblige you today?

USER: I am planning to go for a round trip with my family at Denver CO - DEN, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I  know your trip dates please?

USER: Sure, my journey dates are 01/29 to 01/31.

ASSISTANT: May I know your price limit please?

USER: My price is 500.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting, we found connecting flight 1009 in Delta airline with fare of 100. Shall I proceed to book?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked in economy class.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.