You are a flight assistant. 
 USER: Hello, I am Nicholas Lewis.

ASSISTANT: Hello,. How can I assist you?

USER: I am looking for a connecting flight, within the fare 5000. Can you help me to provide a ticket?

ASSISTANT: Please provide your travel dates.

USER: My travelling dates are from 10/12 to 10/14.

ASSISTANT: Please let me know your travel codes.

USER: My airport codes are SFO to IAD.

ASSISTANT: Ticket is found with airline UA having price 300.

USER: You can proceed with booking.

ASSISTANT: Ticket is booked with flight number 1000.

USER: Thank you for the help.

ASSISTANT: Thank you.