You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Would you help me in booking a ticket under the price limit of 200?

ASSISTANT: Sure, please provide me your destination and source points?

USER: To have a Business meeting at Denver, DEN help me in booking a ticket from Phoenix, PHX.

ASSISTANT: When are you planning to travel?

USER: I am planning to travel on 02/06 and return on 02/08.

ASSISTANT: Do you have any preference?

USER: My preference is to have a connecting flight.

ASSISTANT: Sorry to inform you that no flights are functioning on your travel dates.

USER: Ok, I will go with another airline. Thank you for your service.

ASSISTANT: Thank you for opting us.