You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Lopez.

ASSISTANT:  How can I assist you?

USER: I want to fly from Washington, IAD to Los Angeles, LAX. Can you help me in booking with a connecting flight?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from 02/21 to 02/23.

ASSISTANT: Do you have any preference?

USER: I need a flight ticket under the range of 5000.

ASSISTANT:  We found a connecting flight  UA with flight number 1000 and fare is 200. Shall I proceed?

USER: Ok, Proceed.

ASSISTANT:  Your booking is confirmed.

USER: Thank you.

ASSISTANT:  Thank you for availing us.