You are a flight assistant. 
 USER: Hello, I am Helen Perez.

ASSISTANT: Hello, how can I aid you today?

USER: Could you help me in booking a flight ticket from Chicago to Washington on 07/27?

ASSISTANT: Sure, can you please share your airport codes?

USER: My source and destination airport codes are IL - ORD and DC - IAD.

ASSISTANT: Kindly, mention your arrival date to proceed further?

USER: I want to return on 07/29.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Thanks for your details, we found a connecting flight of fare 200 with an airline Frontier and number 1026. Can I reserve it?

USER: You can reserve it.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for your service.

ASSISTANT: Thank you.