You are a flight assistant. 
 USER: Hello,. I am Samuel Phillips.

ASSISTANT: Hello, how can I assist you?

USER: I would have to visit Washington to meet my neice and surprise to her birthday on 04/11. Could you please help me for booking a flight ticket?

ASSISTANT: Sure, could you please provide your return journey date?

USER: My return date is 04/13.

ASSISTANT: Please provide your airport codes.

USER: My airport codes are  CA-SFO and DC-IAD.

ASSISTANT: Do you have any specifications?

USER: Yes, price limit should be under 5000. I need one connection limit.

ASSISTANT: UA airlines of 1004 flight with single connection and price is 100. Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your kind help.

ASSISTANT: Thank you, have a nice day.