You are a flight assistant. 
 USER: Hello, I am Thomas Baker.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight ticket with price under 200. Could you please help me?

ASSISTANT: Sure we are here to help you out. Please provide me your travelling dates.

USER: Sure, 08/26 and 08/28 are my planned travelling dates.

ASSISTANT: May I know your airport codes?

USER: I want to travel from PA-PHL to DC-IAD.

ASSISTANT: Do you have any connection limit?

USER: I prefer to have a single connection.

ASSISTANT: We found a UA airline, flight number:1003 and the price is 100.

USER: You can proceed with UA airline.

ASSISTANT: Your flight ticket has been processed.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.