Complete the following dialogue with an appropriate tense. Use Present perfect tense when applicable.
Brian : i think the waiter ( forget ) ..... us. We (wait) ..... here for over half an hour and nobody (take) .... our order yet.
Lina : I think you're right. He (walk) ..... by us at least twenty times. He probably thinks we (order, already) ....
Brian : look at the couple over there, they ( be, only) .... here for five or ten minutes and they already have their food.
Lina : he must realize we ( order,not ) .... yet! We (sit) .... here for over half an hour staring at him.
Brian : i dont know if he (notice, even) .... us. He (run) ..... from table to table taking Orders and serving food.