You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: I am Melissa Clark, I am invited my fiend for dinner at Discovery Garden at Houston city. Can you book a flight from CA-SFO?

ASSISTANT: Sure. May I know your travelling dates?

USER: I will fly on 06/22 and return on 06/24.

ASSISTANT: Let me know your destination.

USER: My destination airport is TX-IAH.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight. My budget is 200.

ASSISTANT: There is a flight 1000 in UA airline and price 100 with a connection. Shall I proceed?

USER: Sure.

ASSISTANT: Ok, Your ticket has been done.

USER: Thank you for helping me with booking.

ASSISTANT: Thank you.